A receptor is best described as a structure that
- A. detects a change in the environment and converts it into a nerve impulse
- B. carries impulses from the spinal cord to a muscle
- C. produces a hormone in response to a stimulus
- D. connects two sensory neurones together
Explanation
Receptors are transducers: each responds to one kind of stimulus, such as light, sound, pressure or a chemical, and converts that energy into the electrical signal the nervous system can carry. A structure that carries impulses to a muscle is a motor neurone, and a structure that produces a hormone is a gland. The receptor is therefore always the first component of any reflex pathway.
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