A receptor is best described as a structure that
Correct answer: A. detects a change in the environment and converts it into a nerve impulse
- 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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About Receptors
Receptors are specialized cells or proteins that detect stimuli such as light, sound, pressure, temperature and chemicals, then initiate responses through sensory or hormonal pathways. Questions distinguish sensory receptors from effectors, compare receptor types, and examine stimulus conversion into nerve impulses, including the roles of rods, cones, chemoreceptors and mechanoreceptors.
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