Question

multiple choice question
a receptor is a structure that ______.
o grows in response to a stimulus
o detects a change
o opens and closes in response to blood pressure
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Explanation:

Receptors are structures that detect changes in the internal or external environment. They are not primarily about growing in response to a stimulus, nor are they mainly about opening - closing in response to blood pressure. Their key function is detection.

Answer:

detects a change