TED-ED: The science of skin - Emma Bryce

The video explores the skin, the body's largest organ, covering its structure, functions, and roles. Skin is part of the integumentary system, consisting of three layers: epidermis, dermis, and hypodermis. It serves as a protective barrier, regulates temperature, and provides sensory input. The epidermis is a waterproof layer, while the dermis contains collagen and immune cells. Skin also hosts microorganisms that aid in immune defense. Temperature regulation involves blood vessels and sweat glands, with hair follicles playing a role in heat conservation. Overall, skin is vital for protection, sensation, and temperature control.

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

• 25%

• 16%

• 10%

• 20%

Which cells in the epidermis are responsible for detecting invaders?

• Sebaceous cells

• Langerhans cells

• Keratinocytes

• Merkel cells

What substance do sebaceous glands secrete onto the skin's surface?

• Sebum

• Keratin

• Sweat

• Collagen

How does the skin help regulate body temperature when it's too warm?

• By expanding blood vessels

• By constricting blood vessels

• By producing more keratin

• By increasing sebum production

What is the phenomenon called when tiny muscles cause hair to stand upright?

• Sweating

• Goosebumps

• Shivering

• Blushing

How many hair follicles does the average human have on their scalp?

• 150,000 to 200,000

• 90,000 to 150,000

• 200,000 to 250,000

• 50,000 to 100,000

What is the primary role of the integumentary system?

• To aid in digestion

• To protect and regulate the body

• To support the skeletal system

• To enhance respiratory function