Hair grows from the ________.

Hair grows from the follicles, which are specialized structures located within the dermis layer of the skin. The hair follicle is responsible for the production of hair and consists of various types of cells that divide and grow to form the hair shaft.

While the dermis provides the necessary support and nourishment for hair follicles through blood supply and nerve endings, it's important to note that hair cannot spontaneously grow from the dermis itself. This is why the follicles, which originate in the dermis, are the actual sites of hair growth.

Consider that the hypodermis, which lies beneath the dermis, mainly serves as insulation and a cushion for the body rather than directly contributing to hair growth. The epidermis is the outermost layer of skin and does not contain hair follicles. Therefore, the presence of follicles as the active sites of hair production makes them integral to hair growth.