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The nervous
system is an
internal
communication
system that sends
short electrical
impulses. Its main
component is the
nerves.
 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.
 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.
 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.
 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?
The nervous system
The nervous system
The nervous system

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The nervous system

  • 1.
  • 2.
  • 3. The nervous system is an internal communication system that sends short electrical impulses. Its main component is the nerves.
  • 4.  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.
  • 5.  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.
  • 6.  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.
  • 7.  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?