Final answer:
Hair growth is represented using a graph and occurs in three phases: anagen, catagen, and telogen. During the anagen phase, hair grows rapidly at a rate of 0.3 mm per day. Hair loss can happen if more hair is shed than replaced.
Step-by-step explanation:
Hair growth can be represented using a graph. Hair grows in three phases: the anagen phase, the catagen phase, and the telogen phase. During the anagen phase, cells divide rapidly and push the hair shaft up and out. The length of this phase is measured in years, and hair typically grows at a rate of 0.3 mm per day. The catagen phase lasts only a few weeks, and the telogen phase is a resting phase with no new growth. At the end of the telogen phase, another anagen phase begins, and the hair follicle produces a new hair follicle, pushing out the old hair as the growth cycle repeats itself. Hair loss can occur if more hair is shed than replaced.