Which statement concerning receptors is correct?
A) They respond to various physical or chemical changes in their environment.
B) They carry impulses from the CNS.
C) They are found at the peripheral endings of efferent neurons.
D) They are found only in the somatic nervous system.

Question

Quizplus · Accepted Answer

Receptors are specialized cells or nerve endings that respond to specific stimuli such as light, sound, pressure, temperature, or chemicals in the environment. They generate electrical signals that are transmitted to the central nervous system (CNS) via afferent neurons. Therefore, option A is correct. Option B is incorrect because it is the afferent neurons that carry impulses from receptors to the CNS, not the receptors themselves. Option C is incorrect because receptors are not found at the peripheral endings of efferent neurons, but rather at the peripheral endings of afferent neurons, or in some cases, in specialized cells or organs. Option D is incorrect because receptors are not limited to the somatic nervous system, but rather found in both the somatic and autonomic nervous systems.

Which Statement Concerning Receptors Is Correct