Which of the following is NOT a function of the skin?

• A. Protection
• B. Excretion
• C. Respiration
• D. Temperature regulation

Answer: (C)

The skin serves multiple critical functions for the body, including protection, excretion, and temperature regulation. Protection is achieved through the skin's barrier function, which helps shield underlying tissues from environmental hazards such as pathogens, chemicals, and physical injury. The skin also plays a role in excretion by allowing the removal of certain waste products and excess salts through sweat. Additionally, temperature regulation occurs through mechanisms such as sweating and vasodilation or vasoconstriction of blood vessels, helping maintain a stable internal environment.

However, respiration is not a primary function of the skin. While the skin can facilitate minimal gas exchange through its outer layer, this process is insignificant compared to the role of the lungs and is not a dedicated function of the skin. Thus, respiration does not align with the primary roles assigned to the skin, making it the correct choice for the option that is NOT a function of the skin.