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

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

Answer: (B)

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 certain compounds like vitamin D.
2. Step 2: Analyze each option provided in the question. For example, 'Regulation of body temperature' is a primary function of the integumentary system, as sweat glands and blood vessels in the skin help maintain homeostasis.
3. Step 3: Evaluate 'Protection against pathogens.' The integumentary system acts as a physical barrier, preventing harmful microorganisms from entering the body, making this a primary function.
4. Step 4: Consider 'Sensation of touch.' The skin contains sensory receptors that detect stimuli such as pressure, temperature, and pain, making this another primary function.
5. Step 5: Examine 'Production of blood cells.' This is not a function of the integumentary system. Blood cell production occurs in the bone marrow, which is part of the skeletal system, not the integumentary system.