Biology - Reflexes

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  • Created by: Kez
  • Created on: 01-05-12 20:06


The brain decides how to respond to a stimulus very quickly. However, we need reflexes to aid us when the response is too slow.

Preventing injury

Reflexes are automatic responses that occur when a stimulus has changed. They help prevent us from injury. An example of this would be the shrinking of our pupils when a light is shone in our eye – this is to allow less light into our eye and therefore stop it from being damaged. Or, if you receive a shock, our bodies release an adrenaline hormone automatically, without waiting for an ‘I’ve been shocked’ response.

The passage of information in a reflex, from receptor to effector, is called a reflex arc.

Process of passing information and response

1.       The neurones


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