Why Body Hair?

What protein is human hair primarily made of?

• Collagen

• Elastin

• Keratin

• Melanin

What are the fine, unpigmented hairs that replace lanugo on a baby's body called?

• Terminal hairs

• Vellus hairs

• Androgenic hairs

• Fetal hairs

What causes vellus hairs to develop into coarser terminal androgenic hairs during puberty?

• Increased blood flow

• Exposure to sunlight

• Growing levels of sex hormones called androgens

• Changes in diet

Which of the following is a proposed evolutionary reason for humans having less body hair than other mammals?

• To make it easier to swim in water.

• To reduce the number of parasites on the body.

• To allow for better camouflage in open environments.

• To increase sensitivity to touch.