← Esthetics Chapter 8 Export Options Alphabetize Word-Def Delimiter Tab Comma Custom Def-Word Delimiter New Line Semicolon Custom Data Copy and paste the text below. It is read-only. Select All Skin Histology Study of the structure & composition of the tissue. Physiology Study of the functions of the skin Integumentary System Largest organ in the body, strong waterproof barrier designed to protect us from the outside elements. Skin weighs apporximately 7 pounds & accounts for 15 % of body weight. The body contains One half to two-thirds of the blood in the body & one half of the primary immune cells. Each Inch of cell contains Millions, 15 feet of blood vessels, 12 feet of nevres, 650 sweat glands, 100 oil glands, 65 hairs, 1,300 nerve endings. Sebum Epidermis gives protection from external factors. Melanin In the skin that protects us from the sun. Most amazing feature of the skin Ability to heal itself, repair when injured, protecting the body from infection. Sensory nerve fibers are most abundant in the Fingertips Average bodys internal thermostat is set at 98. 6 Farhrenheit Sweat glands Excrete perspiration & detoxify the body by excreting excess salt & unwanted chemicals. Sebacceous glands Keeps the skin soft & protected from outside elements. Skin is approximately 50 to 60% of Water Epidermis Outermost layer of the skin, made up of a thin protective llayer with many nerve endings. Epidermis is composed of Stratum Germinativum, Spinosum, Granulosum, Lucidum & corneum. Intercellular Cement Protects cells from water loss & provides hydration. Stratum germinativum Known as the basal layer of the epidermis Stratum spinosum Spiny layer above the basal alyer , not lised as a seperate layer Desmosomes Structures that assist in holding cells together Stratum granulosum Composed of cells that resemble granules, filled with keratin & also produce intercellular lipids. Stratum Lucidum Clear layer under the stratum corneum, lucid translucent layer made of small cells that let light pass through Stratum Corneum Top outermost layer of the epidermis Keratinctes Scale like cells made primarily soft keratin Keratin Fiber protein that provids resilency & protection to the skin & that is found in all layers of the dermis. Dermis Live kayer if connective tissue below epidermis, 25x thicker than the epidermis. Dermis consists of 2 layers Papillary layer & retcular layer Lymph vessels Supply nourishment within the skin Papillae Small cone shaped structures at the bottom of hair follicles. Absorption Assimilation od one body by another Adipose tissue A protective cushion that gives contour & smoothness to the body Amino Acid Building block of proteins Adipose Fat, subcutis tissue Technical term for the nail Onyx Apocrine glands Coiled structures attached to hair follicles found in the underarm & genital areas B Vitamins Niacin, riboflavin, thiamine, folacin, biotin Barrier function Lipid matrix that protects the skins surface Calories Heat units which fuel the body by making energy available. Carbs Breakdown the basic chemical sugars that supply energy for the body Dermis Live layer of connective tissue below the epidermis Eccrine glands Sweat gland founf all ober the body not attached to hair follicles & without producing an offensive odor. Excretion Thrown off or elimanated from the body such as sweat Lymph vessels Located in dermis these supply nourishment within the skin. Micronutrients Substances that have no calories or nutritional value yet are essential for body functions. Minerals Inorganic materials required for many reactions of the cell & body. Papilary layer Connectd the dermis to the epidermis. Proteins Chains of amino acids molecules used in body growth Reticular layer Deeper layer of the dermis containing proteins that give the skin its strength & elasticity Retinoic Acid Tropical Vitamin A prescription cream used to treat acne. Sebaceous glands Secrete oil to keep the skin soft & protected Sebum Provides protection from the external factors for the epidermis & lubricates both the skin & hair. Secretion Product manufactured by a gland for special purpose produced between & from the sebaceaus glands in the hair follicles. Sudoriferous glands Excrete perspiration & detoxify the body by excreting excess salt & unwanted chemicals. UVA rays Aging rays, contribute 90 to 95 % of the suns UV rays that reach the earths surface UVB rays Burning rays cause tanning of the skin by affecting melanocytes. Vitamin A Aids in the functioning & repair of the cell Vitamin C Ascorbic acid Vitamins needed for the proper repair of the skin & tissues Vitamin D Promotes the healthy and rapid healing of the skin Vitamin E Helps protect the skin from the harmful effects if the suns rays. Vitamin K Vitamin responsible for the synthesis of factors necessary for blood coagultion.