anagen phase - also known as growth phase, phase during which new hair is produced., alopecia totalis - total loss of scalp hair , amino acids - units that are joined together end-to-end like pop beads by strong, chemical pepetide bonds that form polypeptide chains, porosity - ability of the hair to absorb moisture, elasticity - ability of the hair to stretch and return to its original length without breaking, hair bulb - lowest part of a hair strand, eumelanin - provides natural dark brown to black color to the hair , disulfide bond - strong chemical side bond that is broken by chemicals , alopecia - abnormal hair loss, hair density - the number of individual hairs per square inch, canities - technical term for gray hair , vellus hair - short, fine, unpigmented hair , tinea - technical term for ringworm , sebum - a fatty or oily substance secreted by the sebaceous glands that lubricates the skin, scutula - dry, sulfur, yellow crust on the scalp in tinea favosa or tinea favus, trichoptilosis - technical term for split ends., trichorrhexis nodosa - technical term for knotted hair , hair texture - thickness or diameter of the hair strand, keratin - fibrous protein that grows from cells within hair follicle , melanin - tiny grains of pigment in the cortex that fives natural color to the hair , pityriasis - technical term for dandruff, salt bond - weak bond that breaks with a change in pH, trichology - the study of hair and it's diseases, whorl - hair that forms in a circular pattern on the crown of the head, hair shaft - the hair that projects above the epidermis,

Properties of hair and scalp

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