Human Hair Structure and Function

The video provides an overview of hair structure, including its presence on the body, the layers of skin and hair, and the roles of keratin and melanin. It explains the cuticle, cortex, and medulla, and how these layers contribute to hair characteristics. The video also discusses the types of melanin and their impact on hair color, as well as factors influencing hair shape and texture. The conclusion previews the next video on differentiating human and animal hair.

Which areas of the human body are typically devoid of hair?

• Palms and soles

• Arms and legs

• Scalp and face

• Back and chest

What is the primary difference between the follicle and the shaft of hair?

• Both are living parts of the hair.

• The follicle is dead, and the shaft is living.

• Both are dead parts of the hair.

• The follicle is living, and the shaft is dead.

Which layer of hair is responsible for its strength and water uptake?

• Epidermis

• Medulla

• Cortex

• Cuticle

What protein is primarily found in the cortex of hair?

• Melanin

• Keratin

• Collagen

• Elastin

What determines the color of human hair?

• The amount of keratin

• The shape of the follicle

• The concentration of melanin

• The thickness of the cuticle

What is the function of sebaceous glands in relation to hair?

• They produce sweat.

• They provide nutrients.

• They lubricate the hair.

• They color the hair.

What causes hair to stand up, resulting in goosebumps?

• Melanin production

• Erector pili muscles

• Sebaceous glands

• Cuticle thickening

How does the shape of the hair follicle affect the hair?

• It determines the hair's color.

• It affects the hair's strength.

• It influences whether the hair is straight or wavy.

• It changes the hair's thickness.

What is the role of eumelanin in hair?

• It strengthens the hair shaft.

• It gives hair a red color.

• It is responsible for black and brown hair colors.

• It makes hair curly.

What happens to hair color as melanin production decreases with age?

• Hair becomes gray.

• Hair becomes red.

• Hair becomes thicker.

• Hair becomes curly.