The biology of human skin
Chapter 1
The architecture of our outer shield
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Chapter 2
The evolutionary rainbow of human pigment
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Chapter 3
A bustling microscopic wilderness
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Chapter 4
The magic of self-repair and healing
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YOUR GOAL
Master of The biology of human skin
Ch 3 · A bustling microscopic wilderness
Fun Fact
Face mites: Almost every adult human has microscopic, eight-legged Demodex mites living in their eyelash and nose hair follicles.
Glossary
microbiome (noun)
The community of microorganisms, including bacteria, fungi, and viruses, that inhabit a particular environment. Human skin hosts roughly one million bacteria per square centimeter to protect the body from external pathogens.
The community of microorganisms, including bacteria, fungi, and viruses, that inhabit a particular environment. Human skin hosts roughly one million bacteria per square centimeter to protect the body from external pathogens.
Quiz
Where on the human body is the density of oil-producing sebaceous glands the highest?
Quiz
What microscopic, eight-legged arachnids live naturally in human facial hair follicles?
Quiz
Which oily substance is produced by glands in the skin to waterproof and lubricate it?
Quiz
What acidic component of sweat helps maintain the protective barrier of human skin?
Quiz
Which bacterium is a helpful, dominant resident of healthy human skin that fights off pathogens?
Quiz
How does washing skin with harsh alkaline soaps affect the skin's natural defense barrier?