Nervous System
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The nervous system is the body's master control system and is made up of nerve cells that form nerves. It allows animals to sense changes in their environment and control organ systems. More complex animals have brains and senses like sight, taste, hearing, touch and smell. Simple animals have simple nervous systems, while more complicated animals and vertebrates have more complex nervous systems suited to their lifestyles.
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The nervous system[1]
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The nervous system consists of the brain, spinal cord, and nerves. It has three major functions - to receive and process sensory information, control responses to this information, and coordinate voluntary and involuntary actions. It has two main divisions - the central nervous system (brain and spinal cord) and the peripheral nervous system (nerves). The basic functional unit of the nervous system is the neuron, which transmits electrochemical signals.
Bjstr.ms.id.003672 2 (1)
The document discusses the evolution of nervous systems from simple to more complex forms. It begins with the most primitive sponges which lack a nervous system. It then describes the development of nervous systems in more complex invertebrates like cnidarians, flatworms, and annelids. In annelids, ganglia begin to form but individual segments retain autonomy. The document outlines how invertebrate nervous systems differ from the centralized brain-spinal system of vertebrates. It provides details on the structure and function of the vertebrate central nervous system including the brain, spinal cord, and protective membranes.
Central Nervous system
Our nervous system allows us to perceive and control our body's activities. It consists of the brain, spinal cord, and nerves throughout the body. The brain acts as the control center, receiving signals from and sending signals to different parts of the body via the network of nerves. The human nervous system can be divided into the central nervous system of the brain and spinal cord, and the peripheral nervous system which carries messages between the central system and body organs.
Human body structure and function
The document discusses the relationship between structure and function at different levels of organization in living organisms. Cells form tissues, tissues form organs, organs form organ systems, and organ systems work together to form complete organisms. The structure of each level contributes directly to its specific functions. For example, epithelial tissue covers surfaces and lines cavities due to the tight packing of its cells, while the branched structure of cardiac muscle allows the heart to efficiently pump blood throughout the body.
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Nervous System
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