Sunday, 29 January 2012

2.85 Reflex Arc

Describe the structure and function of a simple reflex arc illustrated by the withdrawal of a finger from a hot object

In this example of the reflex of withdrawing your hand from the hot object:
  • The stimulus is the hot object
  • The receptor is the heat sensor in our skin
  • The impulse travels to the spinal cord along the sensory neuron
  • In the spinal cord the impulse is passed on to the relay neuron
  • This then passes on to the motor neuron
  • The motor neuron carries the impulse to the muscle and the response is the muscle contracts to move away
(Notice how this impulse does not go through the brain first, this is because it makes the response faster and reduces further cell damage due to slow response)


Another Detailed Diagram:
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