Lose weight: Creating a calorie deficit that results in weight loss is hard work. Most recommendations say that to lose weight, you must exercise for at least an hour a day, five times a week. The type of exercise matters, too.
Also found in: Dictionary, Thesaurus, Encyclopedia, Wikipedia. hair shaft. the nongrowing portion of a hair that protrudes from the skin, that is, from the follicle. hair shaft. The keratinized portion of a hair that extends from a hair follicle beyond the surface of the epidermis.
Functions of the hair fiber and hair follicle. The main function of the hair follicle is to produce a hair shaft or fiber. The shaft is the physically visible portion of the hair and plays a significant role both biologically and psychologically. The hair shaft is composed of three parts â the cuticle, the cortex and the medulla.