Biology

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  • Created by: keenan_x
  • Created on: 27-04-14 14:27
What are sense organs?
Receptors
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Name the 5 sense ORGANS
Ears, Tongue, Eyes, Skin, Nose
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Name the senses
Sight, Hearing, Smelling, Toughing, Tasting
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What is CNS?
Central Nervous System - consists of the brain and spinal cord
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How does CNS work?
When a receptor is stimulated, it sends a signal along the nerve cells, to the brain, the brain then co-ordinates the response.
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What is an effector?
An effector is any part of the body that produces the response.
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Give an example of an effector?
A muscle contracting to move the arm.
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What are neurones and what do they do?
Neurones are nerve cells. They carry information as tiny electrical signals.
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What are the 3 neurones?
Sensory Neurons, Motor Neurons, Relay Neurons
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What does the sensory neurone do?
Sensory neurones carry signals from receptors to the spinal cord and brain
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What does the motor neurone do?
Motor neurones carry signals from the CNS to effectors.
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What does the relay neurone do?
Relay neurones carry messages from one part of the CNS to another.
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What is a synapse and how does it work?
Where two neurones meet, there is a tiny gap called a synapse. Signals cross this gap using chemicals released by a neurone. The chemical diffuses across the gap makes the next neurone transmit an electrical signal.
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What is a reflex action?
Reflex actions are rapid and happen without us thinking, sometimes a very quick response is needed, one that does not need the involvement of the brain.
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Give an example of a reflex action
You would pull your hand away from a hot flame without thinking about it
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Other cards in this set

Card 2

Front

Name the 5 sense ORGANS

Back

Ears, Tongue, Eyes, Skin, Nose

Card 3

Front

Name the senses

Back

Preview of the front of card 3

Card 4

Front

What is CNS?

Back

Preview of the front of card 4

Card 5

Front

How does CNS work?

Back

Preview of the front of card 5
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