GENERAL HISTOLOGY

Detailed explanation-1: -Most healthy men and women have 80, 000 to 120, 000 terminal hairs on their scalp. Hair follicles cycle through three primary phases: anagen, catagen and telogen phases. The anagen or growth phase lasts 2 to 6 years, during which primary hair growth occurs.

Detailed explanation-2: -This can be tested by waxing an area of 1cm^2 on your scalp and counting the number of hairs that are removed. Step 2, we must calculate the area of the scalp, and we assume 100 hairs per square cm applies to the whole area of the scalp.