Hair Root Structure

Studying hair and scalp properties benefits you as a cosmetologist in which of the following ways?

• Helps in identifying hair and scalp conditions, choosing appropriate treatments, and providing better client care.

• Allows you to perform only basic haircuts without understanding client needs.

• Enables you to ignore scalp health and focus solely on hair styling.

• Limits your ability to recommend products to clients.

What is trichology?

• Trichology is the study of hair, including its diseases and care.

• Trichology is the study of insects and their habitats.

• Trichology is the study of rocks and minerals.

• Trichology is the study of the human digestive system.

Hair follicles are not found on the palms of the hands or the soles of the feet because:

• These areas are subject to constant friction and pressure, which would damage hair follicles.

• These areas have thicker skin that prevents hair growth.

• There is no blood supply to these areas for hair growth.

• Hair follicles are only present in areas exposed to sunlight.

Which part of the hair is located below the epidermis?

• Hair shaft

• Hair root

• Hair follicle

• Sebaceous gland

Explain the function of the dermal papilla in hair growth.

• The dermal papilla contains blood vessels that supply nutrients that allow the hair to grow.

• The dermal papilla produces melanin that colors the hair.

• The dermal papilla forms the outer protective layer of the hair shaft.

• The dermal papilla secretes oil to lubricate the hair.

Name and describe the structures of the hair root.

• Hair follicle

• Hair bulb

• Dermal papilla

• Arrector pili muscle

• Sebaceous glands

Which parts of the hair are living?

• The hair’s living portion consists of the hair follicle, hair bulb, and dermal papilla.

• Only the hair shaft is living.

• All parts of the hair, including the visible strand, are living.

• The hair cuticle is the only living part.

Name and describe the three layers of the hair shaft.

• The three layers of the hair shaft are: - Cuticle—outermost layer; it is formed from cells that overlap, similar to shingles on a roof; protects the cortex - Cortex—fibrous protein layer that provides strength, elasticity, and color to hair - Medulla—also known as the hair’s pith or core; generally found in coarse hair and beard hair

• The three layers of the hair shaft are: - Epidermis—outermost layer; provides color and moisture - Dermis—middle layer; contains nerves and blood vessels - Hypodermis—innermost layer; stores fat and anchors hair

• The three layers of the hair shaft are: - Follicle—outermost layer; responsible for hair growth - Shaft—middle layer; gives hair its shape - Bulb—innermost layer; supplies nutrients to hair

• The three layers of the hair shaft are: - Cortex—outermost layer; provides moisture - Medulla—middle layer; gives hair its color - Cuticle—innermost layer; responsible for hair growth

What type of hair will always have a medulla?

• Beard hair

• Scalp hair

• Arm hair

• Eyebrow hair

According to the passage, what is the primary protein that makes up hair?

• Keratin

• Collagen

• Elastin

• Actin