Biology 1 - Nervous System

A brief introduction the the nervous system in biology 1 at gcse.

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The Nervous System allows the body to respond to change !

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Parts of the Nervous System

The nervous system consists of...

- Brain

- Spinal Cord

- Spinal Nerves

- Receptors

It allows organismms to react to their surroundings and to co-ordinate their behaviour.

Information from receptors passes along neurones (nerve cells) to the brain which co-ordinates the response.

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Nervous System Flow

The Nervous System goes from the....

  • Receptor, 
  • Sensory Neurones,
  • Relay Neurones,
  • Spinal Cord,
  • Brain,
  • Motor Neurones,
  • Effector.
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There are 3 different types of neurones:

  • Motor Neurone

Where impulse travels away from cell body

  • Sensory Neurone

Where impulse travels towards the cell body

  • Relay Neurone

Where impulse travels away and towards the cell body

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Neurones are streched to make connections between parts of the body!

Neurones do not touch each other, there is a very small gap between them called a synapse.

When an electrical impulse reaches a synapse via 'Neurone A' a chemical transmitter is released which activates receptors on 'Neurone B' and causes a electrical impulse to be generated in 'Neurone B' .

The chemical transmitter is then destroyed.

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Types of Receptor

Different receptors detect different stimuli...

- Eyes detect  ...  Light

- Ears detect   ... Sound and Position/Balance

- Nose detects ... Smell

- Mouth detects ... Taste

- Skin detects ... Touch, Pressure, Temperature and Pain.

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Reflex Action

Sometimes concious actions are too slow to prevent the body from harm...

 Therefore, reflex actions take place, reactions that bypass the brain.

Reflex Actions are Automatic and Quick!

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Thank You

I hope now you feel more confident about the...





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