Biology B1A GSCE

Biology

B1A

GCSE

Done by Almas Hussain

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  • Created by: Almas
  • Created on: 22-05-10 12:47

Biology

Biology

B1A

GSCE

: )

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Coordination

The nervous system

The nervous system coordinates the body's responses to internal and external changes. Information as electrical impulses travel:

  • From receptors to the central nervous system along sensory neurones.
  • From the central nervous system to the effectors along the motor neurones.

The Brain sends Messages (Impulses) to the rest of the body.

The Brain is the central nervous system.

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Receptors

Receptors

Stimuli affect receptors in sense organs such as eyes and ears.

The organs that respont to stimuli are effectors - the muscles and glands:

  • a muscle responds rapidly to information the brain sends as electrical signals.
  • glands secrecte substances (e.g. nose detects food smells)

Some glands secrete hormones, chemicals that travel in the bloodstream to target cells or organs. Adrenaline from the adrenal gland mobilises the body for action.

there are two type of response: Short term responses (Blinking) and Long term responses (going toilet)

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Comments

caroll

Good notes but more needed...

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