The Fascinating Functions of Skin in Human Biology

The video explores the skin, the body's largest organ, which constitutes 16% of body weight and covers 1.7 square meters. It highlights the skin's structure, comprising the epidermis, dermis, and hypodermis, and its functions: protection, regulation, and sensation. The skin acts as a barrier against microbes, aided by keratinocytes and Langerhans cells, and hosts beneficial microorganisms. It regulates temperature through blood vessels and sweat glands, and hair follicles help in temperature control. The integumentary system, including hair and nails, is more than just skin deep.

What percentage of your body weight is made up by your skin?

• 20%

• 25%

• 16%

• 10%

Which system does the skin form the foundation of?

• Integumentary System

• Circulatory System

• Digestive System

• Nervous System

What are the three layers of the skin?

• Epidermis, Dermis, Hypodermis

• Dermis, Subdermis, Epidermis

• Hypodermis, Subdermis, Dermis

• Epidermis, Hypodermis, Subdermis

What type of cells in the epidermis are replaced every four weeks?

• Keratinocytes

• Langerhans cells

• Merkel cells

• Sebaceous cells

What is the role of Langerhans cells in the skin?

• Regulating body temperature

• Secreting sebum

• Producing keratin

• Detecting invaders and communicating with T cells

How do skin microbes contribute to the immune system?

• By producing sweat

• By keeping the immune system in constant surveillance

• By absorbing UV rays

• By regulating body temperature

What happens to blood vessels in the skin when the body is too warm?

• They produce sweat

• They remain unchanged

• They expand

• They constrict

What causes goosebumps on the skin?

• Merkel cells

• Sebaceous glands

• Erector pili muscles

• Sweat glands

How many hair follicles does the average human have?

• 7 million

• 5 million

• 1 million

• 3 million

What is the primary function of the integumentary system?

• Digestion

• Respiration

• Protection and interaction with the environment

• Circulation