Which of the following is a function of the integumentary system?
Oxygen transport
Temperature regulation
Nutrient absorption
Hormone secretion
The Correct Answer is B
A. Oxygen transport: Oxygen transport is performed by blood (hemoglobin in red blood cells) rather than the integumentary system.
B. Temperature regulation: The integumentary system helps regulate body temperature through sweat production and cutaneous blood flow adjustments.
C. Nutrient absorption: Nutrient absorption primarily occurs in the gastrointestinal tract, not the skin (with the exception of limited topical absorption).
D. Hormone secretion: The skin contributes to endocrine activity by synthesizing vitamin D precursors, but widespread hormone secretion is not its main function.
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Related Questions
Correct Answer is C
Explanation
A. To produce synovial fluid:Synovial fluid is produced by the synovial membrane (lining of the joint capsule), not by the articular cartilage.
B. To connect bones:Structural connections between bones are provided by ligaments rather than articular cartilage.
C. To absorb shock and reduce friction:Articular cartilage provides a smooth, resilient surface that distributes load and reduces friction between joint surfaces during movement.
D. To facilitate nerve signaling:Articular cartilage is avascular and largely aneural, so it does not play a direct role in nerve signaling.
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.
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