Coordination And Response

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Coordination And Response
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The Nervous System

The nervous system of a mammal consists of:
  • The central nervous system (CNS) comprising the brain and the spinal cord.
  • The peripheral nervous system (PNS) comprising the cranial nerves, spinal nerves and sense organs.
Neurone
  • A neurone is a nerve cell. 
  • A nerve fibre is a long protoplasmic extensions of the cell body of a neurone. It serves to transmit impulses.
  • A nerve is a collection of nerve fibres.
Types of neurons
  1. Sensory neurones: 
    • a receptor neurone,
    • transmits impulses from the sense organ (receptor) to the CNS.
  2. Motor neurone:
    • an effector neurone.
    • transmits impulses from the CNS to the effectors.
  3. Relay neurone:
    • connects sensory neurones to motor neurones.

Synapse
  • A synapse is a junction between two neurones. 
  • A dendron transmits impulses towards the cell body of a neurone. 
  • An axon transmits impulses away from the cell body of a neurone.
[Image: 2n67kvn.png]​ 

Reflex Actions
  • Reflex actions involve messages being transmitted from the sensory neurone to the motor neurone without involving the conscious part of the brain.
  • A reflex arc is the shortest pathway by which impulses travel from the receptor to the effector in a reflex action.


 

 

 

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(This post was last modified: 03-13-2014 02:16 PM by Given.)
03-13-2014 02:14 PM
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