The Integumentary System Is Composed of
Skin, Glands, Hair, Nails, and Nerve Endings
various parts of the integumentary
the structure of the skin.
the basis for skin colors.
our skin is the most visible organ of your body.
Its appearance and health is affected by nu-
trition, hygiene, blood circulation, age, immu-
nity, genetics, psychological state, and drugs.
Because the appearance of the skin contributes so much to
a person’s self-image, people spend vast amounts of mon-
ey and time on hygiene, beauty products, and medical
treatments to take care of it. The branch of medicine
that specializes in diagnosing and treating skin disor-
ders is called dermatology (
study of ). Let’s take a closer look at skin
and the other structures that make up the integumen-
There Are Many Components
of the Integumentary System
The integumentary system (
to cover) is composed of the skin, hair, oil
and sweat glands, nails, and sensory receptors (Figure 4.1).
T h e in te g u m e n ta ry syste m
The integumentary system is composed of the skin,
hair, oil and sweat glands, nails, and sensory receptors.
S ^ T T
• Two layers: Epidermis,
(oi) g an
• Epidermis: Five
various cell types.
• Dermis: Mainly
connective tissue and
• Three pigments provide
• Contains accessory
glands that secrete oil
and sweat, nerve
endings, and blood
• Protects the body,
makes vitamin D, and
excretes and absorbs
92 CHAPTER 4
The Integumentary System