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The function of the hair follicle receptor (root hair plexus) is to

A.

bind the hair root to the dermis

B.

serve as a source for new epidermal cells for hair growth after the resting stage has passed

C.

allow the hair to assist in touch sensation

D.

cause apocrine gland secretion into the hair follicle

Answer and Explanation

The Correct Answer is C

A. bind the hair root to the dermis: The hair root is anchored to the dermis by the hair follicle itself and connective tissue structures. The receptor does not play a role in binding or physical attachment of the hair root.

B. serve as a source for new epidermal cells for hair growth after the resting stage has passed: New epidermal cells for hair growth arise from the hair matrix at the base of the follicle. The root hair plexus is a sensory nerve ending, not a cell-generating structure.

C. allow the hair to assist in touch sensation: The hair follicle receptor, or root hair plexus, is a network of sensory nerve endings wrapped around the follicle. It detects movement of the hair, making hair an important component of the tactile sensory system.

D. cause apocrine gland secretion into the hair follicle: Apocrine gland secretion is controlled by hormonal and neural signals, but not by the root hair plexus. The plexus functions in sensation, not glandular stimulation.


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Related Questions

Correct Answer is C

Explanation

A. sebaceous:Sebaceous glands are exocrine glands that release sebum into hair follicles or onto the skin surface through ducts. They are not involved in direct secretion into the bloodstream.

B. exocrine:Exocrine glands secrete their products through ducts onto epithelial surfaces, such as sweat or salivary glands. They differ from endocrine glands, which release secretions directly into the blood.

C. endocrine:Endocrine glands, including the thyroid, pituitary, and adrenal glands, secrete hormones directly into the bloodstream. These hormones regulate numerous physiological processes throughout the body.

D. ceruminous:Ceruminous glands are specialized exocrine glands in the ear canal that secrete cerumen (earwax). They release their product via ducts, not into the blood.

Correct Answer is B

Explanation

False:On mRNA, three sequential nucleotides are referred to as a codon. Codons are read during translation to direct the incorporation of specific amino acids into a growing polypeptide chain. A triplet refers to three sequential bases on DNA, which together code for one amino acid. This terminology applies specifically to DNA rather than mRNA.

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