Biology GCSE (1)

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Biology GCSE: The Nervous System

QUESTION:   What is a stimulus?

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Biology GCSE

ANSWER:   A stimulus is a change in your environment which you may need to react to (e.g a recently pounced tiger)

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Biology GCSE: The Nervous System

QUESTION:   What is a receptor?

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Biology GCSE

ANSWER:   Receptors are are groups of cells which are sensitive to a stimulus. They change stimulus energy e.g light energy into electrical impulses.

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Biology GCSE: The Nervous System

QUESTION:   What are the five different sense organs and the receptors they each contain?

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Biology GCSE

ANSWER:   Eyes - Light

                 Ears - Sound and balance

                 Nose - Smell 

                 Tongue - Taste     

                 Skin - Touch, pressure and                                    temperature change   

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Biology GCSE: The Nervous System

QUESTION:   What is the central nervous system (CNS)? 

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Biology GCSE

ANSWER:   The CNS is where all the information from the sense organs is sent, and where reflexes and actions are coordinated. The CNS consists of the brain and the spinal cord only.

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Biology GCSE: The Nervous System

QUESTION:   What is a neurone? 

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Biology GCSE

ANSWER:   Neurone = nerve cell. Neurones transmit the information ( as electrical impulses) very quickly to and from the central nervous systems (CNS).

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Biology GCSE: The Nervous System

QUESTION:   What are effectors?

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Biology GCSE

ANSWER:   Muscle and glands are known as effectors - they respond in different ways. Muscle contract in response to a nervous impulse whereas glands secrete hormones.

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Biology GCSE: The Nervous System

QUESTION:   What is a motor neurone?

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Biology GCSE

ANSWER:   The nerve cells that carry signals to the effectors.

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Biology GCSE: The Nervous System

QUESTION:   What is a sensory neurone?

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Biology GCSE

ANSWER:   The nerve cells that sends signals as electrical impulses from the receptors in the sense organs to the central nervous system (CNS).

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Comments

beth houghton

Great use of a CGP book! i dont have one so i found it very useful! thanks!

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