Which is NOT a function of the integumentary system?

Question

BlackTom AI · Accepted Answer

The integumentary system primarily serves as a protective barrier, sensory interface, and regulator of body temperature, and it performs metabolic roles (like vitamin D synthesis)—it does not serve as a reservoir for calcium.

1) Relevant knowledge points and concepts
- Major components: epidermis, dermis, and hypodermis (subcutaneous tissue).
- Principal functions: protection (physical and microbial barrier), sensation (cutaneous receptors for touch, pain, temperature), thermoregulation (sweat glands, vasodilation/vasoconstriction), metabolic functions (vitamin D synthesis), excretion (small amounts via sweat), and energy storage in adipose of the hypodermis.
- Calcium storage is a primary function of the skeletal system (bone matrix stores ~99% of body calcium), not the integument.

2) Step-by-step reasoning
- Examine each option against known integumentary functions.
  a) Protection: Skin prevents dehydration, blocks pathogens, and shields from UV — clearly a function.
  b) Sensation of the environment: Skin contains mechanoreceptors, thermoreceptors, nociceptors — clearly a function.
  c) Temperature regulation: Sweat production and cutaneous blood flow adjust heat loss — clearly a function.
  d) Storage of calcium: No physiological mechanism in skin stores systemic calcium; bones are the storage sites.

3) Calculations: Not applicable; reasoning is conceptual.

4) Why the correct answer is correct
- The integument does not act as a calcium reservoir. While keratinocytes help produce vitamin D (which facilitates intestinal calcium absorption), the actual storage and regulation of bodily calcium are handled by the skeletal system, kidneys, and endocrine control, not by skin tissue.

5) Why other options are incorrect
- Protection: Correct function — skin is the first-line barrier.
- Sensation of the environment: Correct function — skin houses sensory receptors.
- Temperature regulation: Correct function — via sweating and vascular adjustments.

6) Conclusion
Therefore, "Storage of calcium" is NOT a function of the integumentary system. This matches the provided correct answer: Storage of calcium.

Which is NOT a function of the integumentary system?Single choice

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