Arrector pili are responsible for which action?

Rationale

Arrector pili are responsible for the appearance of goose bumps.

Arrector pili are tiny muscles attached to hair follicles in the skin. When these muscles contract, they cause the hair to stand upright, leading to what is commonly known as "goose bumps" or "goose pimples." This reaction is most often caused by cold or emotional stress.

A (Production of sweat) YOUR ANSWER

Arrector pili are not involved in producing sweat. Sweat production is the responsibility of sweat glands, specifically eccrine and apocrine glands, which are distinct structures in the skin.

B (Increase in skin pigmentation.) YOUR ANSWER

Arrector pili have no role in skin pigmentation. Skin pigmentation, or color, is primarily determined by melanocytes, which are specialized cells that produce the pigment melanin.

C (Acceleration of wrinkling in aging.) YOUR ANSWER

Arrector pili do not accelerate the process of skin wrinkling with aging. Wrinkling is primarily a result of the loss of collagen and elastin in the skin, along with other factors such as sun exposure and lifestyle habits.

D (Appearance of goose bumps.) CORRECT

When arrector pili muscles contract in response to cold or emotional stimuli, they cause the hair follicles to which they are attached to stand erect. This results in the appearance of small bumps on the skin surface, commonly referred to as "goose bumps" or "goose pimples."

Conclusion

Arrector pili are small muscles in the skin that cause the formation of "goose bumps" by pulling the hair follicles upright when they contract. They are not involved in sweat production, skin pigmentation, or the acceleration of skin wrinkling. Understanding the roles of various structures in the skin helps us better understand the body's responses to different stimuli.

Arrector pili are responsible for which action?

Arrector pili are responsible for the appearance of goose bumps.

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