Integumentary SystemATI TEAS 7 cheat sheet

Skin, hair and nails

10 key facts 5 practice questions Reviewed Oct 2026

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Layers

Epidermis — outer, no blood vessels, makes melanin
Dermis — blood vessels, nerves, glands, hair follicles
Hypodermis (subcutaneous) — fat, insulation, cushioning

Functions

Barrier against pathogens and water loss
Temperature regulation — sweat and vessel dilation
Sensation — touch, pressure, pain, temperature
Vitamin D synthesis with sunlight

Glands

Sweat (sudoriferous) — cooling
Oil (sebaceous) — lubricates skin and hair

Healing

The skin is the body's largest organ and the first line of defense

Key takeaway

Skin, hair and nails

Before you read

Test yourself first: 5 questions

Question 1 of 5

Which organ system includes the skin, hair, and nails?

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