Skin, the body’s largest , acts as a protective barrier against , regulates temperature, and enables sensation. It consists of three : the epidermis (outer layer), dermis (middle layer), and hypodermis (subcutaneous layer). The epidermis provides a , while the dermis houses connective tissue, hair follicles, sweat glands, blood vessels, and nerves.
Hair, made of keratin, grows from follicles in the skin, insulation, protection from , and sensory input. Nails, also composed of keratin, protect the tips of fingers and toes and enhance fine .
Glands, including sweat and sebaceous glands, are embedded in the skin. regulate body temperature through perspiration, while sebaceous glands produce , an oily substance that lubricates and waterproofs the skin and hair.
Blood vessels oxygen, nutrients, and waste throughout the body, playing a crucial role in circulation and . They include arteries, , and .
Nerves are responsible for signals between the brain and body, enabling sensation, movement, and autonomic functions. Together, blood vessels and nerves maintain vital processes and respond to and stimulation.
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