1 markWhich definition would be the best description of a stimulus?
A detectable change in the internal or external environment of an organism
A gap between two neurones
A signal which is passed through the nervous system as electrical charge
A nerve pathway which triggers an automatic response
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1 markThe image below shows a a sensory neurone which forms part of a reflex arc in the nervous system.
An impulse moves along the neurone from Q to P.
What structures would be found at P?
An effector
A motor neurone
A synapse
A relay neurone
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1 markA motor neurone is usually stimulated by a relay neurone.
Which part of the motor neurone is first stimulated by a relay neurone?
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1 markThe diagram shows a reflex arc.
A patient needs treatment for a leg injury.
An anaesthetic is injected to block nerve impulses to prevent pain but still allow movement of the leg.
Where was the anaesthetic injected in this patient?
At X
At Y
At Z
At X, Y and Z
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1 markWhich label is pointing to the myelin sheath in a sensory neurone?
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1 markWhat is the name of the gap between two neurones?
Axon
Dendrite
Lumen
Synapse
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