The human head and or scalp can produce somewhere in the area of 100k and 150k hair follicles at any given time. These hair follicles are in groups of 2, 3, 4 and single hairs and randomly arranged on the scalp however the hairline normally only has 1’s and 2 hair follicles. Outside of the scalp the human body can have up to 5 million follicles however these are usually no where near the length, coarseness or have the same growth cycle as scalp hair.
Ninety percent of scalp hairs are in the “growth” phase where upon the hair grows continuously up to as long as 7 years in time before shifting into a resting phase also known as telegen phase. This phase is much shorter and lasts only a few months. Every hair follicle repeats this process approximately between 10 and 20 times over a period of a lifetime. The rate at which hair grows is approximately a 1/2 inch per month or 0.45mm per day.
Another interesting fact is that humans can lose anywhere from 80 to 100 hairs per day. This may seem to alarm people however it really isn’t much when comparing this to the amount of hairs on a scalp.
Chief Surgical Technologist