Which is a function of the skin?

• A. Movement
• B. Protection
• C. Temperature regulation
• D. Excretion and secretion

Answer: (D)

The skin’s ability to excrete and secrete is a direct, ongoing activity powered by its glands. Sweat glands release sweat, which helps remove some waste products such as salts and small amounts of urea, and sebaceous glands secrete sebum to keep the skin lubricated and protected. This combination shows the skin actively producing and releasing substances, a clear functional role. While protection and temperature regulation are important skin roles, excretion and secretion specifically highlight the glandular outputs that demonstrate the skin’s functional activity. Movement isn’t a function of the skin itself, since movement mainly depends on muscles and bones rather than the skin’s processes.