The function of the root hair plexus is to ________. ?
a. bind the hair root to the dermis
b. allow the hair to assist in touch sensation
c. serve as a source for new epidermal cells for hair growth after the resting stage has passed
d. cause apocrine gland secretion into the hair follicle
The correct answer and explanation is:
Correct Answer:
b. Allow the hair to assist in touch sensation
Explanation:
The root hair plexus, also known as the hair follicle receptor, is a network of sensory nerve endings that surrounds the base of a hair follicle in the dermis. Its primary function is to detect mechanical changes in the environment, such as vibrations or movement of hair, and transmit sensory information to the brain.
Each hair follicle is embedded in the skin and connected to the nervous system through the root hair plexus. This nerve network is highly sensitive and allows humans and other mammals to perceive even the slightest touch or displacement of hair, contributing to the sense of touch. When a hair is moved, the associated nerve endings in the root hair plexus send signals to the central nervous system, alerting the individual to possible environmental changes or external stimuli, such as insects crawling on the skin or a light breeze.
This function is particularly important for survival in many animals, as it enhances their ability to detect threats, navigate through their surroundings, and sense potential predators. In humans, the root hair plexus plays a role in tactile perception, contributing to an individual’s ability to respond to physical stimuli efficiently.
The other answer choices do not accurately describe the function of the root hair plexus:
- (a) Binding the hair root to the dermis – This function is performed by connective tissue and the hair follicle structure itself, not the root hair plexus.
- (c) Serving as a source for new epidermal cells – Hair growth relies on the hair matrix within the hair bulb, not the root hair plexus.
- (d) Causing apocrine gland secretion – Apocrine glands release sweat into hair follicles, but this is not regulated by the root hair plexus.
Thus, the correct answer is “b. Allow the hair to assist in touch sensation.”
Now, I’ll generate an image illustrating the root hair plexus and its function.
Here is an anatomical illustration of the human hair follicle, highlighting the root hair plexus and its function in touch sensation. Let me know if you need any modifications or further explanations!
