Skin, Skeletal, and Muscular Systems: the Integumentary System

The video explains that the skin, often overlooked as an organ, is the largest organ of the body, making up about 15% of body weight. It serves as a protective barrier, preventing microorganisms from entering and retaining body fluids. The skin plays a crucial role in excretion by removing waste through sweat, regulates body temperature, and protects against UV rays. It also synthesizes vitamin D. The skin is composed of two main layers: the epidermis, which is the outer protective layer, and the dermis, which contains connective tissue, blood vessels, and glands. The dermis supports various functions, including sensation and insulation.

What percentage of the body's total weight does the skin account for?

• 10%

• 15%

• 20%

• 25%

Which vitamin is synthesized by the skin when exposed to sunlight?

• Vitamin D

• Vitamin A

• Vitamin B

• Vitamin C

What is the primary function of the pigments in the skin?

• To help in vitamin synthesis

• To provide color

• To regulate temperature

• To protect against ultraviolet rays

What is the name of the tough, protective protein formed in the epidermis?

• Elastin

• Collagen

• Keratin

• Melanin

What is the function of sebaceous glands in the skin?

• To sense pressure

• To secrete oils for protection

• To insulate the body

• To produce sweat