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Which gland produces sebum to lubricate the skin and hair?

A.

Sebaceous gland

B.

Apocrine gland

C.

Eccrine gland

D.

Ceruminous gland

Answer and Explanation

The Correct Answer is A

A. Sebaceous gland: Sebaceous glands secrete sebum (an oily substance) that lubricates and waterproofs skin and hair.
B. Apocrine gland: Apocrine glands produce a protein-rich sweat (body odor after bacterial action), found in axilla/groin; not the primary source of sebum.
C. Eccrine gland: Eccrine glands produce watery sweat for thermoregulation distributed over much of the body.
D. Ceruminous gland: Ceruminous glands are modified sweat glands in the ear canal that produce cerumen (earwax), not sebum for hair/skin lubrication.


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Related Questions

Correct Answer is C

Explanation

A. Moisturize the skin:Moisturizing of the skin is assisted by sebum and natural moisturizing factors, not melanin.
B. Regulate body temperature:Body temperature regulation is mediated by sweat production and cutaneous blood flow, not melanin.
C. Protect against ultraviolet (UV) radiation:Melanin absorbs and scatters UV radiation, reducing DNA damage in skin cells and providing photoprotection.
D. Provide structural support:Structural support of skin is provided mainly by collagen and elastin in the dermis, not by melanin.

Correct Answer is D

Explanation

A. Triceps brachii: The triceps brachii primarily extends the elbow and does not play a major role in scapular stabilization.
B. Biceps brachii: The biceps brachii flexes the elbow and assists with forearm supination but is not a primary scapular stabilizer.
C. Quadriceps femoris: The quadriceps femoris is a thigh muscle group that extends the knee and is unrelated to scapular stabilization.
D. Rotator cuff muscles: The rotator cuff (supraspinatus, infraspinatus, teres minor, subscapularis) stabilizes the glenohumeral joint and contributes to dynamic control of the scapula and shoulder during arm movements.

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