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Sagot :
Final answer:
Hair composition, physiological roles, nail composition.
Explanation:
Composition of Hair:
Hair is primarily composed of proteins such as keratin. It also contains water, lipids, pigments, and trace elements.
Physiological Roles of Hair:
- Protection: Hair acts as a physical barrier, protecting the scalp from UV rays, dust, and other environmental elements.
- Sensory Function: Hair follicles are connected to nerve endings, allowing for the sensation of touch.
- Thermoregulation: Hair helps regulate body temperature by trapping heat near the body or releasing it.
Nail Composition:
Nails are composed of keratin, the same protein found in hair. They consist of the nail plate, nail bed, cuticle, and nail root.
Learn more about Hair composition, physiological roles, nail composition here:
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