Question

question 18 of 25
which of the following statements is true of secretory nerve fibers?
select the correct response:
they are sensory nerves attached to sweat and oil glands.
they send messages to the central nervous system to react to pain.
they send messages to the brain to react to cold and heat.
they control the flow of sebum to the surface of the skin.

Explanation:

1. Analyze the first option: Sensory nerves are for receiving information, while secretory nerve fibers are motor (efferent) and control glandular secretion, so this is incorrect.
2. Analyze the second option: Sending messages to the CNS to react to pain is the role of sensory (afferent) nerves, not secretory (motor - related to secretion) nerve fibers, so this is incorrect.
3. Analyze the third option: Reacting to cold and heat is a sensory function, and secretory nerve fibers are not involved in sensory perception but in controlling secretion, so this is incorrect.
4. Analyze the fourth option: Secretory nerve fibers (part of the autonomic nervous system, motor fibers) can control the flow of sebum (a secretion from sebaceous glands) to the skin surface, which matches their function of controlling glandular secretion.

Answer:

The correct statement is: They control the flow of sebum to the surface of the skin.