Question

the function of the root hair plexus is to ________.
○ serve as a source for new epidermal cells for hair growth after the resting stage has passed
○ cause apocrine gland secretion into the hair follicle
○ allow the hair to assist in touch sensation
○ bind the hair root to the dermis

Explanation:

The root hair plexus is a network of sensory nerve fibers around a hair follicle. It is a type of mechanoreceptor (sensory receptor for touch). When the hair is bent (even slightly), it stimulates the nerve fibers in the root hair plexus. This allows the body to detect very light touch sensations related to the movement of the hair.

• The first option is incorrect because the source of new epidermal cells for hair growth is the hair matrix (not the root hair plexus).
• The second option is wrong as apocrine gland secretion is not related to the function of the root hair plexus. Apocrine glands secrete substances for other purposes (like in body odor in certain areas) and their secretion is not regulated by the root hair plexus.
• The fourth option is incorrect because structures like the hair follicle itself and connective - tissue attachments bind the hair root to the dermis, not the root hair plexus.

Answer:

allow the hair to assist in touch sensation