NURSING 277 Lecture Notes - Lecture 6: Sebaceous Gland, Hair Loss, Xeroderma
Document Summary
Protection skin minimizes injury from physical, chemical, thermal, and light-wave sources. Prevents penetration skin is barrier that stops invasion of microorganisms and loss of water and electrolytes from within the body. Perception skin is a vast sensory surface holding the neurosensory end-organs for touch, pain, temperature, and pressure. Temperature regulation skin allows heat dissipation through sweat glands and heat storage through subcutaneous insulation. Identification people identify one another by unique combos of facial characteristics, hair, skin color, and even fingerprints. Communication emotional expression vascular mechanisms such as blushing or blanching. Wound repair skin allows cell replacement of surface wounds. Absorption and excretion skin allows limited excretion of some metabolic wastes, by- products of cellular decomposition such as minerals, sugars, amino acids, cholesterol, uric acid, and urea. Production of vitamin d skin is the surface on which uv light converts cholesterol into vitamin d. Hair threads of keratin (tough fibrous protein) Hair growth is cyclical (w/ active + resting phases).
