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

• A. Production of blood cells
• B. Sensation of touch
• C. Protection against pathogens
• D. Regulation of body temperature

Answer: (A)

Verified step by step guidance

1. Step 1: Begin by identifying the primary functions of the integumentary system. The integumentary system includes the skin, hair, nails, and associated glands. Its main roles are protection, sensation, thermoregulation, and synthesis of vitamin D.
2. Step 2: Analyze each option provided in the question. For example, 'Sensation of touch' is a primary function of the integumentary system because sensory receptors in the skin detect stimuli such as pressure, temperature, and pain.
3. Step 3: Evaluate 'Protection against pathogens.' This is also a primary function of the integumentary system, as the skin acts as a physical barrier to prevent the entry of harmful microorganisms.
4. Step 4: Consider 'Regulation of body temperature.' This is another primary function of the integumentary system, achieved through mechanisms like sweating and vasodilation or vasoconstriction of blood vessels in the skin.
5. Step 5: Examine 'Production of blood cells.' This is NOT a primary function of the integumentary system. Blood cell production occurs in the bone marrow, which is part of the skeletal system, not the integumentary system.