Question

Human hair grows in a cycle that includes a growth phase and a rest phase. A small fraction of the hairs on the scalp are in the rest phase, while the majority of the hairs on the scalp are in the growth phase, which allows the hair on the scalp to grow long. Conversely, the majority of hairs in areas such as the eyelashes are in the rest phase, which keeps those hairs short.

Name: human hair grows in a cycle that includes a growth phase and a rest phase a small fraction of the hairs on the scalp are in the rest phase while the majority of the hairs on the scalp are in 17998
Uploaded: 2024-03-09T14:43:25-08:00
Duration: 1 min 31 s
Channel: Crystal Wang
Description: human hair grows in a cycle that includes a growth phase and a rest phase a small fraction of the hairs on the scalp are in the rest phase while the majority of the hairs on the scalp are in 17998

          Human hair grows in a cycle that includes a growth phase and a rest phase. A small fraction of the hairs on the scalp are in the rest phase, while the majority of the hairs on the scalp are in the growth phase, which allows the hair on the scalp to grow long. Conversely, the majority of hairs in areas such as the eyelashes are in the rest phase, which keeps those hairs short.

Added by Marie G.

Biology for AP Courses

Julianne Zedalis, John Eggebrecht

Instant Answer

Solved by Expert Crystal Wang

03/09/2024

Step 1

Human hair growth is cyclical and consists of three main phases: anagen (growth phase), catagen (transition phase), and telogen (rest phase). During the anagen phase, hair actively grows. The catagen phase is a short transitional period when hair growth stops, and Show more…

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Human hair grows in a cycle that includes a growth phase and a rest phase. A small fraction of the hairs on the scalp are in the rest phase, while the majority of the hairs on the scalp are in the growth phase, which allows the hair on the scalp to grow long. Conversely, the majority of hairs in areas such as the eyelashes are in the rest phase, which keeps those hairs short.