Question

Hair cell divide how many times in a year

Answer 1

Hair cells divide rapidly during the anagen phase, which lasts between 2 to 7 years and is marked by the active growth of hair. The hair growth cycle includes a transition phase (catagen) and a resting phase (telogen) before restarting. The growth rate during anagen is on average 0.3 mm per day.

Step-by-step explanation:

The number of times hair cells divide in a year varies, as hair growth occurs in three distinct phases: the anagen phase, which can last from 2 to 7 years and involves rapid cell division at the hair root; the catagen phase, a brief 2-3 week period that transitions from active growth; and the telogen phase, resting for 2-4 months without new growth. At the end of the telogen phase, a new anagen phase begins, during which basal cells in the hair matrix produce a new follicle and push out the old hair. This cycle repeats throughout a person's life, and hair typically grows at an average rate of 0.3 mm per day during the anagen phase.

Answer 2

Hair cells are present inside the inner ear that acts as a receptor of sound. Researchers affirmed that once there is a damage to the hair cell, it can regenerate in birds.

Damage hair cell can lead to loud noise which in turn affect the ear. The supporting cells are present along with the hair cells. When the hair cells get damaged, the supporting hair cell gets the signal to start the process of regeneration.