Which of the following is not a component of the integumentary system?

Which of the following is not a component of the integumentary system?

• A. Skin
• B. Nails
• C. Heart
• D. Hair

Answer: (C)

The main idea here is telling apart what belongs to the integumentary system from structures in other body systems. The integumentary system includes skin, hair, nails, and the glands and tissues tied to them, all working together to protect the body, regulate temperature, and sense the environment. The heart does not fit into this group—it belongs to the circulatory system, whose job is to pump blood and support the body’s tissues, including the skin, but it’s not part of the protective covering itself. So the heart is not a component of the integumentary system.

The main idea here is telling apart what belongs to the integumentary system from structures in other body systems. The integumentary system includes skin, hair, nails, and the glands and tissues tied to them, all working together to protect the body, regulate temperature, and sense the environment. The heart does not fit into this group—it belongs to the circulatory system, whose job is to pump blood and support the body’s tissues, including the skin, but it’s not part of the protective covering itself. So the heart is not a component of the integumentary system.