Final answer:
Hair is made up of three main components: the shaft, root, and bulb. The shaft is the visible part of the hair which contains the cuticle, cortex, and the medulla. The root lies beneath the skin, lodged inside a hair follicle, and the bulb at the bottom of the root forms new hair cells and pushes up the older ones through the follicle.
Step-by-step explanation:
The hair is a vital part of the integumentary system and plays numerous roles in human aesthetics, regulation of body temperature, and providing sensory information. A strand of hair is divided into three main components: the shaft, the root, and the bulb.
The shaft is the visible part that protrudes from the skin, and it is made up of three layers namely; the cuticle, cortex, and the medulla. The cuticle is the outer layer, and it protects the inner layers. The cortex contains pigment which gives hair its color, and the medulla is the inner core of the hair.
The root is the part of the hair that lies beneath the surface of the skin. It is lodged inside the hair follicle. The bottom part of the root is expanded to form the bulb, which resides within a dermal papilla and derives nutrients from the bloodstream. The bulb develops new hair cells which push old cells up through the follicle, as a result, forming the hair shaft.
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