Which of the following is NOT a function of the integumentary system?

• A. Production of red blood cells
• B. Protection against pathogens
• C. Synthesis of vitamin D
• D. Regulation of body temperature

Answer: (A)

Verified step by step guidance

1. Step 1: Begin by understanding the primary functions of the integumentary system. The integumentary system includes the skin, hair, nails, and associated glands. Its main roles are protection, regulation, and synthesis of certain substances.
2. Step 2: Review the listed options and match them to the known functions of the integumentary system. For example, protection against pathogens is a key function as the skin acts as a physical barrier.
3. Step 3: Consider the synthesis of vitamin D. The skin plays a crucial role in producing vitamin D when exposed to sunlight, which is essential for calcium absorption and bone health.
4. Step 4: Examine the regulation of body temperature. The integumentary system helps regulate temperature through mechanisms like sweating and vasodilation or vasoconstriction of blood vessels in the skin.
5. Step 5: Identify the option that does not align with the integumentary system's functions. Production of red blood cells is a function of the skeletal system (specifically the bone marrow), not the integumentary system.