13. Skin: The Jack-of-all-Trades
The skin is the largest organ in the human body, serving multiple critical functions including protection, regulation of body temperature, and sensation. It consists of three main layers: the epidermis, dermis, and hypodermis, each serving distinct roles from pigmentation to insulation. The chapter also outlines the various skin appendages such as hair and nails, and emphasizes the importance of skin care for maintaining health.
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Sections
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What we have learnt
- The skin serves as a barrier against physical harm and pathogens while preventing moisture loss.
- It plays a vital role in regulating body temperature through sweat and blood flow.
- Skin is involved in sensation, excretion, vitamin D synthesis, and serves as an energy storage reserve.
Key Concepts
- -- Epidermis
- The outer layer of skin consisting of dead and living cells that contains melanin pigment.
- -- Dermis
- The middle layer of skin that contains blood vessels, nerves, sweat glands, and hair follicles.
- -- Hypodermis
- The innermost layer of skin made of fat and connective tissue, providing insulation and cushioning.
- -- Sebaceous Glands
- Glands that secrete oil to keep the skin moist and soft.
- -- Sweat Glands
- Glands that produce sweat for cooling and excretion of waste products.
Additional Learning Materials
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