Which of the following is FALSE regarding the integumentary system?

• A. It is composed only of epithelial tissue.
• B. It helps regulate body temperature.
• C. It provides a barrier against pathogens.
• D. It is the body's largest organ system.

Answer: (A)

Verified step by step guidance

1. Step 1: Begin by understanding the integumentary system. It includes the skin, hair, nails, glands, and associated structures. Its primary functions are protection, temperature regulation, sensory reception, and excretion.
2. Step 2: Analyze the statement 'It is composed only of epithelial tissue.' The integumentary system is not solely composed of epithelial tissue; it also includes connective tissue, muscle tissue, and nervous tissue. This statement is false.
3. Step 3: Evaluate the statement 'It helps regulate body temperature.' The integumentary system plays a key role in thermoregulation through sweat production and blood vessel dilation or constriction in the dermis. This statement is true.
4. Step 4: Assess the statement 'It provides a barrier against pathogens.' The skin acts as a physical and chemical barrier, preventing the entry of pathogens and harmful substances. This statement is true.
5. Step 5: Examine the statement 'It is the body's largest organ system.' The integumentary system is indeed the largest organ system, covering the entire body. This statement is true.