The Nervous system is the network of nerve cells and fibers that transmits nerve impulses between parts of the body. The Nervous system decides on how different animals will react to certain situations.
Why do we need it?
Without the nervous system, how would we know when our hands get to close to fire? Pain chemicals travel through our peripheral nervous system (the nervous system outside the brain and spinal cord) and into our central nervous system (the complex of nerve tissues that controls the activities of the body). This is when we receive the message of pain and we are able to react in time, in this situation our reaction would be to pull our hands away from the fire avoiding burns.
Vocabulary
Ganglia- nerve that gives the body the ability to feel Nerve cord- cord that stretches across parts of the body that connect all ganglia to the Central Nervous System