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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