The integumentary system, which consists of the skin (cutaneous membrane) and accessory structures, accounts for approximately 16% of the total body weight of an adult.
Integumentary
System
After
studying this chapter, readers should be able to:
1. Explain
the structure of the dermis and epidermis.
2. Describe
the normal and pathological colors skin can have.
3. List
the functions of the skin.
4. Describe
the structure of nails.
5. Discuss
the various kinds of glands in the skin and the secretions of each.
6. Explain
how the sweat glands play a major role in regulating body temperature.
7. Describe
the three most common forms of skin cancer.
8. Describe
the location and function of sebaceous and ceruminous glands.
9. Explain
the anatomic parts of a hair.
10. Describe the effects of aging on the integumentary system.
The integumentary
system, which consists of the skin
(cutaneous membrane) and accessory structures, accounts for approximately 16%
of the total body weight of an adult. Its surface area covers from 1.5 to 2 m2.
The skin, which is the largest organ of the body in surface area and weight, is
continually bombarded by all sorts of environmental components, including
attack by microorganisms, radiation from sunlight, and exposure to chemicals.
The accessory integu-mentary system structures include hairs, nails, sweat
glands, and oil glands. The integumentary system is the first line of defense
against the environment. The skin, as well as the deeper hypodermis, has
many functions such as protection, excretion, temperature maintenance, melanin
production, keratin produc-tion, vitamin D3 (cholecalciferol)
synthesis, lipid stor-age, and sensory detection.
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