introduction to the nervous system pptx 1
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The nervous system is composed of two main divisions: the central nervous system (CNS) containing the brain and spinal cord, and the peripheral nervous system (PNS) containing nerves. Sensory neurons carry messages from receptors to the CNS for integration, then motor neurons carry output commands to effectors. There are two types of motor actions - somatic in skeletal muscle controlled voluntarily and autonomic in smooth and cardiac muscle controlled involuntarily with sympathetic and parasympathetic divisions. The cells of the nervous system are neurons, which transmit nerve impulses, and neuroglia which are supporting cells like oligodendrocytes that form a myelin sheath insulating neurons in the CNS and Schwann cells insulating neurons in the
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introduction to nervous system.ppt
The document provides an introduction to the nervous system. It discusses that the nervous system is composed of two main divisions: the central nervous system (CNS) containing the brain and spinal cord, and the peripheral nervous system (PNS) containing nerves. Sensory information travels via sensory neurons to the CNS, which integrates the information and sends motor commands via motor neurons. Motor commands can target skeletal muscle through somatic nerves or smooth and cardiac muscle through the autonomic nervous system. Neurons transmit nerve impulses while various neuroglial cells provide structural and nutritional support, including myelinating neurons to increase transmission speed.
Nervous system introduction
The nervous system is divided into the central nervous system (CNS) and peripheral nervous system (PNS). The CNS contains the brain and spinal cord, which receive sensory input, integrate information, and respond through motor output. The PNS includes the somatic and autonomic nervous systems. The somatic system connects the CNS to skeletal muscles and senses, while the autonomic system regulates involuntary functions through its sympathetic and parasympathetic divisions. Neurons are the basic functional units that conduct electrical signals, while neuroglia provide support and insulation to neurons.
Ch7 notes1
The document provides notes on the nervous system. It discusses the organization and functions of the central nervous system (CNS) and peripheral nervous system (PNS). The CNS is made up of the brain and spinal cord, and performs integrating and command functions. The PNS connects to the CNS and is composed of nerves and ganglia. The document outlines the structure and function of neurons, including their classification and generation of nerve impulses. It also summarizes the anatomy of the brain and spinal cord, as well as common brain dysfunctions.
Nervous tissue
This document provides information on nervous tissue and neurons. It discusses that nervous tissue consists of neurons and neuroglia. Neurons are specialized to receive sensory stimuli, process information, and transmit signals via nerve impulses. Neuroglia support and nourish neurons. The structure of neurons includes a cell body containing a nucleus, dendrites that receive signals, and an axon that transmits signals. Neurons are classified based on their structure and function. Synapses allow neurons to communicate via chemical or electrical signaling. The document also describes various sensory nerve endings and the stimuli they detect, as well as motor end plates that transmit signals to effector cells.
Nervous System -Autonomic Nervous System-Neurons -Ganglia - Nerves Copy.
The nervous system is the body's communication network, coordinating and regulating all bodily functions. Comprising the central nervous system (CNS) and peripheral nervous system (PNS), it consists of neurons, specialized cells transmitting electrical and chemical signals. The CNS, consisting of the brain and spinal cord, interprets and processes information. The PNS extends from the CNS, transmitting signals between the brain, spinal cord, and the rest of the body. Sensory neurons detect stimuli, while motor neurons control muscle movement. This intricate system enables sensory perception, voluntary and involuntary actions, and regulates bodily processes, ensuring homeostasis and facilitating responses to the environment.
Nervous System -Autonomic Nervous System-Neurons -Ganglia - Nerves Copy.
The nervous system is the body's communication network, coordinating and regulating all bodily functions. Comprising the central nervous system (CNS) and peripheral nervous system (PNS), it consists of neurons, specialized cells transmitting electrical and chemical signals. The CNS, consisting of the brain and spinal cord, interprets and processes information. The PNS extends from the CNS, transmitting signals between the brain, spinal cord, and the rest of the body. Sensory neurons detect stimuli, while motor neurons control muscle movement. This intricate system enables sensory perception, voluntary and involuntary actions, and regulates bodily processes, ensuring homeostasis and facilitating responses to the environment.
Lect. 9 nervous tissues
The document discusses the structure and function of the nervous system. It describes how the nervous system is divided into the central nervous system (CNS), which includes the brain and spinal cord, and the peripheral nervous system (PNS). Neurons are the basic functional units that transmit signals in the nervous system. The document outlines the main parts of neurons including the cell body, dendrites, axon, and myelin sheath. It also describes the different types of neurons and specialized cells that support neurons called neuroglial cells.
Human regulatory system 1
The regulatory system in the human body consists of the neural system, endocrine system, and sensory organs. The neural system contains nerve cells that transmit electrical and chemical signals throughout the body to coordinate functions. Disorders can occur if there are imbalances in neurotransmitters in the neural system, which can be caused by conditions like Parkinson's disease or affected by drugs that influence neurotransmitters.
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introduction to nervous system.ppt
The document provides an introduction to the nervous system. It discusses that the nervous system is composed of two main divisions: the central nervous system (CNS) containing the brain and spinal cord, and the peripheral nervous system (PNS) containing nerves. Sensory information travels via sensory neurons to the CNS, which integrates the information and sends motor commands via motor neurons. Motor commands can target skeletal muscle through somatic nerves or smooth and cardiac muscle through the autonomic nervous system. Neurons transmit nerve impulses while various neuroglial cells provide structural and nutritional support, including myelinating neurons to increase transmission speed.
Nervous system introduction
The nervous system is divided into the central nervous system (CNS) and peripheral nervous system (PNS). The CNS contains the brain and spinal cord, which receive sensory input, integrate information, and respond through motor output. The PNS includes the somatic and autonomic nervous systems. The somatic system connects the CNS to skeletal muscles and senses, while the autonomic system regulates involuntary functions through its sympathetic and parasympathetic divisions. Neurons are the basic functional units that conduct electrical signals, while neuroglia provide support and insulation to neurons.
Ch7 notes1
The document provides notes on the nervous system. It discusses the organization and functions of the central nervous system (CNS) and peripheral nervous system (PNS). The CNS is made up of the brain and spinal cord, and performs integrating and command functions. The PNS connects to the CNS and is composed of nerves and ganglia. The document outlines the structure and function of neurons, including their classification and generation of nerve impulses. It also summarizes the anatomy of the brain and spinal cord, as well as common brain dysfunctions.
Nervous tissue
This document provides information on nervous tissue and neurons. It discusses that nervous tissue consists of neurons and neuroglia. Neurons are specialized to receive sensory stimuli, process information, and transmit signals via nerve impulses. Neuroglia support and nourish neurons. The structure of neurons includes a cell body containing a nucleus, dendrites that receive signals, and an axon that transmits signals. Neurons are classified based on their structure and function. Synapses allow neurons to communicate via chemical or electrical signaling. The document also describes various sensory nerve endings and the stimuli they detect, as well as motor end plates that transmit signals to effector cells.
Nervous System -Autonomic Nervous System-Neurons -Ganglia - Nerves Copy.
The nervous system is the body's communication network, coordinating and regulating all bodily functions. Comprising the central nervous system (CNS) and peripheral nervous system (PNS), it consists of neurons, specialized cells transmitting electrical and chemical signals. The CNS, consisting of the brain and spinal cord, interprets and processes information. The PNS extends from the CNS, transmitting signals between the brain, spinal cord, and the rest of the body. Sensory neurons detect stimuli, while motor neurons control muscle movement. This intricate system enables sensory perception, voluntary and involuntary actions, and regulates bodily processes, ensuring homeostasis and facilitating responses to the environment.
Nervous System -Autonomic Nervous System-Neurons -Ganglia - Nerves Copy.
The nervous system is the body's communication network, coordinating and regulating all bodily functions. Comprising the central nervous system (CNS) and peripheral nervous system (PNS), it consists of neurons, specialized cells transmitting electrical and chemical signals. The CNS, consisting of the brain and spinal cord, interprets and processes information. The PNS extends from the CNS, transmitting signals between the brain, spinal cord, and the rest of the body. Sensory neurons detect stimuli, while motor neurons control muscle movement. This intricate system enables sensory perception, voluntary and involuntary actions, and regulates bodily processes, ensuring homeostasis and facilitating responses to the environment.
Lect. 9 nervous tissues
The document discusses the structure and function of the nervous system. It describes how the nervous system is divided into the central nervous system (CNS), which includes the brain and spinal cord, and the peripheral nervous system (PNS). Neurons are the basic functional units that transmit signals in the nervous system. The document outlines the main parts of neurons including the cell body, dendrites, axon, and myelin sheath. It also describes the different types of neurons and specialized cells that support neurons called neuroglial cells.
Human regulatory system 1
The regulatory system in the human body consists of the neural system, endocrine system, and sensory organs. The neural system contains nerve cells that transmit electrical and chemical signals throughout the body to coordinate functions. Disorders can occur if there are imbalances in neurotransmitters in the neural system, which can be caused by conditions like Parkinson's disease or affected by drugs that influence neurotransmitters.
Nervous tissue 1
Lecture notes and diagrams to help high school anatomy and physiology students learn the general functions of the nervous system and types of glial support nerve cells, types of neurons and anatomy of typical neurons.
Nervous system word.docx
The nervous system has three main functions: sensory input, integration of stimuli, and motor output. It is structurally divided into the central nervous system (brain and spinal cord) and peripheral nervous system. The peripheral nervous system is further divided into the somatic and autonomic systems. Nervous tissue contains two main cell types: neurons, which transmit electrical signals, and neuroglia, or glial cells, which support neurons. The brain is divided into regions including the cerebrum, diencephalon, brain stem, and cerebellum. Cranial and spinal nerves connect the central and peripheral nervous systems.
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Brain Anatomy & Physiology
The document provides an overview of the nervous system, including its basic functions and organization. It describes the different types of neurons (sensory, motor, interneurons), divisions of the nervous system (central, peripheral, somatic, autonomic), and components of neurons (cell body, dendrites, axon, myelin sheath). It also summarizes the mechanisms of the action potential, synaptic transmission, and refractory periods.
Nervous system
This document summarizes the structure and types of cells in the nervous system. It describes that the nervous system contains central and peripheral divisions. The central nervous system contains the brain and spinal cord while the peripheral nervous system contains cranial and spinal nerves. There are two main cell types - neurons which are excitable cells that transmit signals and neuroglia which are non-excitable supporting cells. Neurons contain a cell body, dendrites and an axon. Neuroglia include astrocytes, oligodendrocytes and microglia. The document also provides an overview of the spinal nerve, reflex arc and different types of reflex actions.
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The document discusses how brain cells work. It notes that the human brain contains two main types of cells - neurons and glial cells. Glial cells outnumber neurons and provide support and insulation. Neurons are the main signaling cells and transmit electrical signals via long projections called axons to other neurons or effector cells. At the junction between neurons, called a synapse, the electrical signal is converted to a chemical signal via neurotransmitters. This allows signals to be transmitted from one neuron to the next and enables the complex functioning of the human brain.
Nervous system ( anatomy and physiology)
the topic contain function of nervous system, classification of nervous system, neurons anatomy, structural classification of neurons, functional classification of neurons, nerve impulse
A and P 181 191
The document provides an overview of the nervous system, including its main functions and divisions. It discusses the central nervous system (CNS), which includes the brain and spinal cord, and the peripheral nervous system (PNS), which branches out from the CNS. Within these systems are neurons, the main cell type, and neuroglia which support neuron function. The document outlines the structure of neurons and how nerve impulses are conducted. It also describes the divisions of the nervous system including somatic, autonomic, afferent and efferent systems.
Body control systems
The nervous system and endocrine system are the two major body control systems. The nervous system consists of tissues that conduct nerve impulses quickly, bringing about fast, short-term changes. It has a central nervous system of the brain and spinal cord, and a peripheral nervous system of all other nerves. The endocrine system consists of glands that produce chemical messages called hormones, which travel through the bloodstream more slowly and bring about long-term changes. The nervous system contains neurons that receive, transmit, and process sensory information and control motor responses through electrical and chemical signaling between neurons.
Physiology ch 9 lecture notes
The nervous system has two main divisions:
1. The central nervous system (CNS) comprising the brain and spinal cord.
2. The peripheral nervous system (PNS) comprising all other nerves outside the CNS.
Nerve tissue contains neurons, which transmit signals, and neuroglial cells which provide support. Neurons communicate via electrochemical signals called nerve impulses, traveling along nerve pathways between neurons. The brain and spinal cord are protected by membranes and fluid within the skull and vertebral column. The brain has three main parts which work together to control voluntary and involuntary functions.
Nervous System In Humans
The document summarizes the nervous system in humans. It describes the central nervous system as including the brain and spinal cord. The peripheral nervous system has nerve cells with axons that extend through the limbs. The peripheral nervous system has three divisions: somatic, sympathetic, and parasympathetic. Neurons transmit nerve messages while glial cells support and protect neurons. Neurons receive signals at dendrites, transmit signals along axons, and communicate between cells via neurotransmitters at synapses.
PRESENTED BY ORJI JONATHAN ORJI
This presentation is done by Orji Jonathan Orji with the guidance of Tamriko valishvili, Associate Prof. Doctor of medicine. Is very educative, well organized and a good learning material, enjoy it to the fullness. Comment, like and share if you fine it useful.
2 Human Body Nervous system.pptx
The nervous system has four primary functions: sensing the world, transmitting information, processing information, and producing responses. It is composed of neurons, which are the basic functional units that transmit electrochemical signals around the body. The nervous system has two main divisions: the central nervous system, comprising the brain and spinal cord, and the peripheral nervous system, comprising all other nerves. The central nervous system receives, interprets, and sends signals to the peripheral nervous system to coordinate body functions and responses.
Anatomy nervous tissue chap 13
The human nervous system is composed of neurons and glial cells. Neurons send and receive signals using long processes, while glial cells provide support and protection. The nervous system develops from embryonic tissue and is divided into the central nervous system (brain and spinal cord) and peripheral nervous system. The CNS coordinates information processing, while the PNS connects to sensory organs and muscles. Neurons have a cell body, dendrites that receive signals, and an axon that transmits signals. Glial cells in the CNS include astrocytes, oligodendrocytes, microglia, and ependymal cells, while Schwann cells are the main type in the PNS.
ANS (SYMPATHETIC and PARASYMPATHETIC)
The nervous system has two main divisions: the central nervous system (CNS) and the peripheral nervous system (PNS). The autonomic nervous system (ANS) is a division of the PNS and controls involuntary body functions. It has two branches - the sympathetic and parasympathetic systems. The sympathetic system activates the fight or flight response while the parasympathetic system activates the rest and digest response. Both systems involve a two-neuron chain with a preganglionic neuron originating in the CNS and a postganglionic neuron that releases neurotransmitters like acetylcholine and norepinephrine.
Nervous System Overview.pptx
Coordinates voluntary and involuntary actions of the body and transmits signals between different parts of the body.
Together with endocrine system controls and integrates activities of the body.
Nervous system allows us to perceive, understand, and respond to our environment.
corelating neurohistology with functions By Dr. Arshad
Neurons are specialized cells that rapidly communicate via long processes called neurites. In the central nervous system, neuronal cell bodies and dendrites are found in gray matter, while axons wrapped in myelin sheaths comprise white matter. Neurons maintain a resting potential and generate action potentials to transmit signals. They communicate via synapses, where chemical transmitters trigger changes in the receiving cell. Axotomized neurons degenerate if cut off from their cell bodies, and regeneration is limited in the central nervous system. The CNS contains two main cell types: neurons, which conduct signals, and neuroglial cells like astrocytes and oligodendrocytes, which provide support.
2 Human Body Nervous system.pptx
The nervous system has four primary functions: sensing the world, transmitting information, processing information, and producing responses. It has two main divisions - the central nervous system (CNS) containing the brain and spinal cord, and the peripheral nervous system (PNS) containing all other nerves. The basic functional unit of the nervous system is the neuron, which transmits electrochemical signals through a reflex arc pathway involving sensory, inter, and motor neurons.
5) The Nervous System.pdf and anatomy ok
The document discusses the nervous system, including its major divisions of the central nervous system and peripheral nervous system. It describes the roles and components of the nervous system, including neurons, neuroglia, the spinal cord and spinal nerves, the somatic nervous system, and the autonomic nervous system. It also discusses the protective structures of the brain and spinal cord, the main divisions of the brain, and the twelve pairs of cranial nerves.
Introduction to the Nervous System.pptx
This document provides an overview of the nervous system for introductory health profession training. It defines key terms, describes the structure and function of the central and peripheral nervous systems, and examines the roles of neurons, neuroglia, and reflex arcs. Major topics covered include the brain regions and lobes, spinal cord, cerebrospinal fluid, and common clinical disorders of the nervous system. The goal is for students to understand the basic anatomy and physiology of this complex network that regulates the human body.
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Lecture notes and diagrams to help high school anatomy and physiology students learn the general functions of the nervous system and types of glial support nerve cells, types of neurons and anatomy of typical neurons.
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The nervous system has three main functions: sensory input, integration of stimuli, and motor output. It is structurally divided into the central nervous system (brain and spinal cord) and peripheral nervous system. The peripheral nervous system is further divided into the somatic and autonomic systems. Nervous tissue contains two main cell types: neurons, which transmit electrical signals, and neuroglia, or glial cells, which support neurons. The brain is divided into regions including the cerebrum, diencephalon, brain stem, and cerebellum. Cranial and spinal nerves connect the central and peripheral nervous systems.
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This document summarizes the structure and types of cells in the nervous system. It describes that the nervous system contains central and peripheral divisions. The central nervous system contains the brain and spinal cord while the peripheral nervous system contains cranial and spinal nerves. There are two main cell types - neurons which are excitable cells that transmit signals and neuroglia which are non-excitable supporting cells. Neurons contain a cell body, dendrites and an axon. Neuroglia include astrocytes, oligodendrocytes and microglia. The document also provides an overview of the spinal nerve, reflex arc and different types of reflex actions.
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The document discusses how brain cells work. It notes that the human brain contains two main types of cells - neurons and glial cells. Glial cells outnumber neurons and provide support and insulation. Neurons are the main signaling cells and transmit electrical signals via long projections called axons to other neurons or effector cells. At the junction between neurons, called a synapse, the electrical signal is converted to a chemical signal via neurotransmitters. This allows signals to be transmitted from one neuron to the next and enables the complex functioning of the human brain.
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The document provides an overview of the nervous system, including its main functions and divisions. It discusses the central nervous system (CNS), which includes the brain and spinal cord, and the peripheral nervous system (PNS), which branches out from the CNS. Within these systems are neurons, the main cell type, and neuroglia which support neuron function. The document outlines the structure of neurons and how nerve impulses are conducted. It also describes the divisions of the nervous system including somatic, autonomic, afferent and efferent systems.
Body control systems
The nervous system and endocrine system are the two major body control systems. The nervous system consists of tissues that conduct nerve impulses quickly, bringing about fast, short-term changes. It has a central nervous system of the brain and spinal cord, and a peripheral nervous system of all other nerves. The endocrine system consists of glands that produce chemical messages called hormones, which travel through the bloodstream more slowly and bring about long-term changes. The nervous system contains neurons that receive, transmit, and process sensory information and control motor responses through electrical and chemical signaling between neurons.
Physiology ch 9 lecture notes
The nervous system has two main divisions:
1. The central nervous system (CNS) comprising the brain and spinal cord.
2. The peripheral nervous system (PNS) comprising all other nerves outside the CNS.
Nerve tissue contains neurons, which transmit signals, and neuroglial cells which provide support. Neurons communicate via electrochemical signals called nerve impulses, traveling along nerve pathways between neurons. The brain and spinal cord are protected by membranes and fluid within the skull and vertebral column. The brain has three main parts which work together to control voluntary and involuntary functions.
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The document summarizes the nervous system in humans. It describes the central nervous system as including the brain and spinal cord. The peripheral nervous system has nerve cells with axons that extend through the limbs. The peripheral nervous system has three divisions: somatic, sympathetic, and parasympathetic. Neurons transmit nerve messages while glial cells support and protect neurons. Neurons receive signals at dendrites, transmit signals along axons, and communicate between cells via neurotransmitters at synapses.
PRESENTED BY ORJI JONATHAN ORJI
This presentation is done by Orji Jonathan Orji with the guidance of Tamriko valishvili, Associate Prof. Doctor of medicine. Is very educative, well organized and a good learning material, enjoy it to the fullness. Comment, like and share if you fine it useful.
2 Human Body Nervous system.pptx
The nervous system has four primary functions: sensing the world, transmitting information, processing information, and producing responses. It is composed of neurons, which are the basic functional units that transmit electrochemical signals around the body. The nervous system has two main divisions: the central nervous system, comprising the brain and spinal cord, and the peripheral nervous system, comprising all other nerves. The central nervous system receives, interprets, and sends signals to the peripheral nervous system to coordinate body functions and responses.
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The human nervous system is composed of neurons and glial cells. Neurons send and receive signals using long processes, while glial cells provide support and protection. The nervous system develops from embryonic tissue and is divided into the central nervous system (brain and spinal cord) and peripheral nervous system. The CNS coordinates information processing, while the PNS connects to sensory organs and muscles. Neurons have a cell body, dendrites that receive signals, and an axon that transmits signals. Glial cells in the CNS include astrocytes, oligodendrocytes, microglia, and ependymal cells, while Schwann cells are the main type in the PNS.
ANS (SYMPATHETIC and PARASYMPATHETIC)
The nervous system has two main divisions: the central nervous system (CNS) and the peripheral nervous system (PNS). The autonomic nervous system (ANS) is a division of the PNS and controls involuntary body functions. It has two branches - the sympathetic and parasympathetic systems. The sympathetic system activates the fight or flight response while the parasympathetic system activates the rest and digest response. Both systems involve a two-neuron chain with a preganglionic neuron originating in the CNS and a postganglionic neuron that releases neurotransmitters like acetylcholine and norepinephrine.
Nervous System Overview.pptx
Coordinates voluntary and involuntary actions of the body and transmits signals between different parts of the body.
Together with endocrine system controls and integrates activities of the body.
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Neurons are specialized cells that rapidly communicate via long processes called neurites. In the central nervous system, neuronal cell bodies and dendrites are found in gray matter, while axons wrapped in myelin sheaths comprise white matter. Neurons maintain a resting potential and generate action potentials to transmit signals. They communicate via synapses, where chemical transmitters trigger changes in the receiving cell. Axotomized neurons degenerate if cut off from their cell bodies, and regeneration is limited in the central nervous system. The CNS contains two main cell types: neurons, which conduct signals, and neuroglial cells like astrocytes and oligodendrocytes, which provide support.
2 Human Body Nervous system.pptx
The nervous system has four primary functions: sensing the world, transmitting information, processing information, and producing responses. It has two main divisions - the central nervous system (CNS) containing the brain and spinal cord, and the peripheral nervous system (PNS) containing all other nerves. The basic functional unit of the nervous system is the neuron, which transmits electrochemical signals through a reflex arc pathway involving sensory, inter, and motor neurons.
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The document discusses the nervous system, including its major divisions of the central nervous system and peripheral nervous system. It describes the roles and components of the nervous system, including neurons, neuroglia, the spinal cord and spinal nerves, the somatic nervous system, and the autonomic nervous system. It also discusses the protective structures of the brain and spinal cord, the main divisions of the brain, and the twelve pairs of cranial nerves.
Introduction to the Nervous System.pptx
This document provides an overview of the nervous system for introductory health profession training. It defines key terms, describes the structure and function of the central and peripheral nervous systems, and examines the roles of neurons, neuroglia, and reflex arcs. Major topics covered include the brain regions and lobes, spinal cord, cerebrospinal fluid, and common clinical disorders of the nervous system. The goal is for students to understand the basic anatomy and physiology of this complex network that regulates the human body.
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corelating neurohistology with functions By Dr. Arshad
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'Land uses,' which are determined by both human activities and the physical characteristics of the
land.
The utilization of land is impacted by human needs and environmental factors. In countries
like India, rapid population growth and the emphasis on extensive resource exploitation can lead
to significant land degradation, adversely affecting the region's land cover.
Therefore, human intervention has significantly influenced land use patterns over many
centuries, evolving its structure over time and space. In the present era, these changes have
accelerated due to factors such as agriculture and urbanization. Information regarding land use and
cover is essential for various planning and management tasks related to the Earth's surface,
providing crucial environmental data for scientific, resource management, policy purposes, and
diverse human activities.
Accurate understanding of land use and cover is imperative for the development planning
of any area. Consequently, a wide range of professionals, including earth system scientists, land
and water managers, and urban planners, are interested in obtaining data on land use and cover
changes, conversion trends, and other related patterns. The spatial dimensions of land use and
cover support policymakers and scientists in making well-informed decisions, as alterations in
these patterns indicate shifts in economic and social conditions. Monitoring such changes with the
help of Advanced technologies like Remote Sensing and Geographic Information Systems is
crucial for coordinated efforts across different administrative levels. Advanced technologies like
Remote Sensing and Geographic Information Systems
9
Changes in vegetation cover refer to variations in the distribution, composition, and overall
structure of plant communities across different temporal and spatial scales. These changes can
occur natural.
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- 2. Composition of Nervous System Two main divisions 1) Central Nervous system (CNS) brain and spinal chord 2)Peripheral Nervous System (PNS) nerves
- 3. Remember from Homeostasis Message is received from sensory receptor along sensory neuron (afferent pathway) Messages reaches brain and is integrated (control center) Reaction command sent down efferent pathway along motor neuron (motor output)
- 4. Types of Motor Actions Somatic Happens in skeletal muscle voluntary Autonomic Happens in smooth and cardiac muscle Involuntary 2 parts Sympathetic and parasympathetic
- 5. Cells of the Nervous System Broken down into two groups 1) supporting cells 2) neurons
- 6. Examples of Neuroglia (supporting cells) 1) astrocytes – anchor neurons to capillaries 2) microglia – phagocytes (digest debris and dead cells) 3) Ependymal cells- ciliated; always on surface near spinal fluid; circulates fluid
- 7. One more Neuroglial cell (in CNS) 4)Oligodendrocytes – fatty; insulated nerve fibers Produce myelin sheath which surround and insulate the nerve fiber
- 8. In PNS Instead of oligodendrocytes, they have Schwann cells, which insulate the nerve fiber Satellite cells – form protective layer around nerve cell body
- 9. Neurons Specifically designed to transmit message (nerve impulse)
- 10. Parts of a Neuron 1)Cell Body- contains nucleus 2) fiber (process)- carries message to next neuron Toward cell body = dendrites Away from cell body = axon
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