These are student initiated research and presentation.

1. Nervous System
Brenda and Annabelle – 4y

2.  Nervous system
 TE-Nervous system diagram.svg
 The human nervous system.
 Details
 Identifiers
 Latin systema nervosum
 MeSH D009420
 TA falto los daños que le pueden afectar%20Entity%20TA98%20EN.htm le falto los daños que le pueden afectar
 FMA 7157
 Anatomical terminology
 [edit on Wikidata]
 Neuroscience portal
 The nervous system is the part of an animal's body that coordinates its voluntary and involuntary actions and transmits signals to and from
different parts of its body. Nervous tissue first arose in wormlike organisms about 550 to 600 million years ago. In vertebrate species it consists
of two main parts, the central nervous system (CNS) and the peripheral nervous system (PNS). The CNS contains the brain and spinal cord. The
PNS consists mainly of nerves, which are enclosed bundles of the long fibers or axons, that connect the CNS to every other part of the body.
Nerves that transmit signals from the brain are called motor or efferent nerves, while those nerves that transmit information from the body to
the CNS are called sensory or afferent. Most nerves serve both functions and are called mixed nerves. The PNS is divided into a) somatic and b)
autonomic nervous system, and c) the enteric nervous system. Somatic nerves mediate voluntary movement. The autonomic nervous system is
further subdivided into the sympathetic and the parasympathetic nervous systems. The sympathetic nervous system is activated in cases of
emergencies to mobilize energy, while the parasympathetic nervous system is activated when organisms are in a relaxed state. The enteric
nervous system functions to control the gastrointestinal system. Both autonomic and enteric nervous systems function involuntarily. Nerves
that exit from the cranium are called cranial nerves while those exiting from the spinal cord are called spinal nerves.
Information

3.  The nervous system is formed of two parts that are integrally linked with each other. The brain and the nervous system has multiple functions that are vital for
normal functioning of the body.
 Transmission of nerve impulses
 A nerve impulse is essentially an electrical stimulus that travels over the cell's membrane. It passes through the axons and dendrites of the neurons. It travels via
the dendrites from the skin and then reaches the cell body, axon, axon terminals and the Synapse of the neuron.
 The Synapse is the junction between two neurons where the impulse moves from one to the other. At the synapse neurotransmitters are present. These are
chemical transmitters of messengers that transmit the impulse. They include Acetylcholine and Noradrenaline.
 The impulse continues to the next dendrite, in a chain reaction till it reaches the brain that in turn instructs the skeletal muscles to work.
 The Reflex Arc
 These reflexes are automatic, involuntary responses. They may or may not involve the brain for example blinking does not involve the brain. The Reflex arc is the
main functional unit of the nervous system that helps a person react to a stimulus.
 Functions of different parts of the nervous system
 Different parts of the nervous system have different functions. They can be outlined as follows.
 Functions of the brain
 The brain is made up of several parts. Each part has a certain function:
Function

4. Part of nervous system

5. Thank you