Why Body Hair?

The video explores the evolution and functions of human hair, comparing it to other mammals. It discusses different types of hair, their growth phases, and evolutionary theories explaining why humans have less hair than other primates. The video also highlights the purposes of body hair, such as protection from the sun, deterring parasites, and aiding in mate attraction through pheromones.

What are some of the functions of hair in mammals?

• Storing fat

• Digesting food

• Producing vitamin D

• Regulating body temperature and camouflage

What is the name of the fine, unpigmented hair that replaces lanugo in infants?

• Vellus hair

• Androgenic hair

• Keratin hair

• Terminal hair

Why do different types of hair on the human body grow at different rates?

• Due to different phases and rates of growth in hair follicles

• Due to the presence of more sweat glands

• Because of varying levels of keratin

• Because of the amount of sunlight exposure

What evolutionary advantage might less body hair provide according to one theory?

• Increased vitamin D production

• Better camouflage in forests

• Reduced shelter for parasites

• Improved swimming ability

Why might humans have retained hair on their heads according to the theories discussed?

• To protect from cold weather

• To provide shade from the sun

• To attract mates

• To store nutrients