Human skin
Human Skin
The Human Skin (pronunciation: /ˈhjuːmən skɪn/) is the outer covering of the body and is the largest organ of the integumentary system. The skin has up to seven layers of ectodermal tissue and guards the underlying muscles, bones, ligaments, and internal organs.
Etymology
The term "skin" is derived from the Old Norse 'skinn', which means 'animal hide'. "Human", on the other hand, comes from the Latin 'humanus', meaning 'of man' or 'human'.
Structure
Human skin is composed of two primary layers: the Epidermis and the Dermis, each serving distinct roles in the overall function of the skin. The epidermis provides a waterproof barrier and creates our skin tone, while the dermis contains tough connective tissue, hair follicles, and sweat glands. Below these layers lies the Hypodermis, which is made up of fat and connective tissue.
Functions
The skin has multiple roles in the body. It acts as a barrier that protects our body from mechanical impacts, pressure, temperature, micro-organisms, radiation and chemicals. It also functions in immune response, sensation, Vitamin D synthesis, and temperature regulation.
Related Terms
- Epidermis: The outermost layer of the skin.
- Dermis: The layer of skin beneath the epidermis that contains connective tissue, hair follicles, and sweat glands.
- Hypodermis: The deepest layer of the skin, composed of fat and connective tissue.
- Immune System: The body's defense against infectious organisms and other invaders.
- Vitamin D: A vitamin produced by the body when the skin is exposed to sunlight.
External links
- Medical encyclopedia article on Human skin
- Wikipedia's article - Human skin
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