The human integumentary system
Chapter 1
The skin as a living shield
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Chapter 2
The science of hair and nails
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Chapter 3
The skin as a living ecosystem
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YOUR GOAL
Master of The human integumentary system
Ch 2 · The science of hair and nails
Fun Fact
Nail growth: Fingernails grow faster on your dominant hand because increased usage boosts blood circulation to the fingertips.
Glossary
keratin (noun)
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.
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.