Human Hair Color and Structure

The video explores the science behind human hair color, focusing on the role of keratin and melanin. It explains how different types of melanin, eumelanin and pheomelanin, contribute to various hair colors. The video also discusses the genetic factors, such as the MC1R gene, that influence hair color. As people age, melanocytes die off, leading to gray or white hair. The video concludes by encouraging viewers to engage with questions about human hair.

What is the primary structural component of human hair?

• Elastin

• Keratin

• Melanin

• Collagen

Which cells are responsible for producing the pigment that colors hair?

• Fibroblasts

• Melanocytes

• Keratinocytes

• Adipocytes

What type of melanin gives hair a brown or black color?

• Eumelanin

• Carotene

• Xanthophyll

• Pheomelanin

Which pigment is responsible for red, orange, or yellowish hair colors?

• Eumelanin

• Xanthophyll

• Carotene

• Pheomelanin

What happens to melanocytes as people age, leading to gray hair?

• They start to die off

• They increase in number

• They produce more melanin

• They change color

What is the main reason for the variation in hair color among individuals?

• Different hair growth rates

• Different levels of keratin

• Different types of hair follicles

• Varying levels of eumelanin and pheomelanin

Which gene is primarily associated with the production of eumelanin?

• OCA2

• SLC24A5

• TYR

• MC1R

What happens when the MC1R gene is not active in melanocytes?

• They produce mostly pheomelanin

• They produce more keratin

• They produce more eumelanin

• They stop producing melanin

What is the role of the MC1R gene in hair color?

• It affects hair thickness

• It influences the production of eumelanin

• It controls hair growth speed

• It determines hair texture

What is the main topic of the video?

• The structure of human nails

• The science behind hair color

• The process of hair growth

• The history of hair styling