HUMAN SKIN Meaning and
Definition
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Human skin is the external integumentary covering of the human body, consisting of multiple layers of tissue that envelop and protect the underlying internal structures. It serves as a vital protective barrier that shields the body from various environmental factors such as pathogens, harmful substances, and excessive water loss. The skin acts as a sensory organ, where receptors detect and relay information regarding temperature, touch, pressure, and pain to the brain.
The human skin is composed of three major layers: the epidermis, dermis, and hypodermis (subcutaneous tissue). The outermost layer, the epidermis, contains primarily dead skin cells called keratinocytes. It protects against pathogens and water loss through specialized cells called keratinized cells. The middle layer, the dermis, consists of connective tissues, blood vessels, nerve endings, sweat glands, sebaceous glands, and hair follicles. It provides structural support, nourishment, and regulates temperature. The hypodermis or subcutaneous tissue is the innermost layer, mainly composed of fat and connective tissues. It helps to insulate the body and store energy.
Etymology of HUMAN SKIN
The word "human skin" has a straightforward etymology. "Human" is derived from the Latin word "humanus", which relates to or pertains to humans. "Skin" comes from the Old English word "scinn", which means the outer covering or the outer layer of an individual. Together, "human skin" refers to the outer covering or tissue that forms the physical body of a human being.
