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Module 2e - A&P

Introduction to the Human Body

hair important functions: eyelashes and eyebrowe protect the eyes from dust and perspiration
nasal hairs trap dust and prevent it from being inhaled into the lungs
hair of the scalp helps heep us warm and plays cosmetic role
hair growth influenced by the sex hormones estrogen and testosterone
parts of hair shaft:the part above the surface of the skin
root: part that extends from the dermis to the surface
hair color genetically controlled and is determined by the type and amount of melanin
arrector piili muscles attached to the hair follicle is a bundle of smooth muscle cells
alopecia loss of hair genetic or drug re;ated
nails are thin plates of stratified squamous epithelial cells that contain a very hard form of keratin
protect fingers and toes from injury
each nail has the following: free edge, nail body (fingernail), and nail root,lunula, and cuticle
nail clubbing chronic lung and heart disease, insufficent supply of oxygenated blood over a period of time
not pink poor oxygenated blood makes nail bluish
nail abuse trauma to nail, causes nail to thick or hypertropy
brittle generally due to poorly oxygenated blood and nutritional anemias
Created by: janmaire