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explain the nervous system

Explanation & Answer

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The nervous system
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The nervous system is the part of an animal that coordinates its actions by transmitting signals to
and from different parts of its body. Nervous tissue first arose in wormlike organisms about 550
to 600 million years ago. In vertebrates it consists of two main parts, the central nervous
system (CNS) and the peripheral nervous system (PNS). The CNS consists of
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 sen...
