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The nervous system


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The nervous system

  1. 1. The nervoussystem is aninternalcommunicationsystem that sendsshort electricalimpulses. Its maincomponent is thenerves.
  2. 2.  Nerves carry information and instructions to and from the brain. The way a nerve works is through a chain of nerve cells that carries a signal (as an electrical impulse) to or from the brain and it is received by the nerve endings of other nerve cells. There are three types of nerves: sensory nerves, motor nerves and mixed nerves.
  3. 3.  Theybring information from the eyes, ears and other sense organs to the brain. Motor nerves are the nerves responsible for all voluntary skeletal and somatic movement. Thesenerves contain both motor and sensory fibers.
  4. 4.  The longest nerve we have is the tibial nerve. It is 50 cm in adults. We have thousands of nerves distributed among all our body. “pins and needles” The slowest nerves travel at about 1 mps, and the fastest ones travel at 100 mps. Reflex action.
  5. 5.  Howis the information transmitted to the body? Which are the three types of nerves? What causes „pins and needles‟? What is the axon‟s role? How do you make your body move?