The skin as a living shield
The science of hair and nails
The skin as a living ecosystem
YOUR GOAL
Master of The human integumentary system
artiteacher Hair and Nails
Hair on your head, nails on your hands, keratin's running the show!
artiteacher Human fingernails and toenails grow at different rates, influenced by blood flow, age, and even hand dominance.
artiteacher Every hair on your head grows in a three-stage cycle that determines its length and lifespan.
artiteacher Stack skin layers to discover how your skin, hair, and nails protect you.
Nail growth: Fingernails grow faster on your dominant hand because increased usage boosts blood circulation to the fingertips.
A tough, fibrous protein that forms the main structural constituent of hair, feathers, hoofs, claws, and horns. This protein makes up the dead, visible cells of the human hair shaft and nail plate.
Apart from human hair and nails, where else is keratin commonly found in nature?
On average, how many hairs does a human naturally shed from their head each day?
Which tough, fibrous protein makes up the primary structure of human hair and nails?