The Integumentary System

The Integumentary System - • The integumentary system is...

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The Integumentary System Vitamin D Production o Ultraviolet light stimulates the production of a precursor molecule in the skin that is modified by the liver and kidneys into vitamin D. o Vitamin D increases calcium uptake in the intestines. Temperature Regulation o Through dilation and constriction of blood vessels, the skin controls heat loss from the body. o Evaporation of sweat cools the body. Excretion o Skin glands remove small amounts of waste products but are not important in excretion. Effects of Aging on the Integumentary System Blood flow to the skin is reduced, the skin becomes thinner, and elasticity is lost. Sweat and sebaceous glands are less active, and the number of melanocytes decreases. The Integumentary System as a Diagnostic Aid
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Unformatted text preview: • The integumentary system is easily observed and often reflects events occurring in other parts of the body (e.g., cyanosis, jaundice, rashes). Burns • Partial-thickness burns damage only the epidermis (first-degree burn) or the epidermis and the dermis (second-degree burn). • Full-thickness burns (third-degree burns) destroy the epidermis, dermis, and usually underlying tissues. Skin Cancer • Basal cell carcinoma involves the cells of the stratum basale and is readily treatable. • Squamous cell carcinoma involves the cells immediately superficial to the stratum basale and can metastasize. • Malignant melanoma involves melanocytes, can metastasize, and is often fatal....
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