Hair

Question 1

What is hair made up of

Answer 1

Dead keratinized cells

Question 2

Where does hair originate

Answer 2

Epidermal penetration of dermis called “hair follicle”

Question 3

How does hair growth begin

Answer 3

It begins with production of keratinocytes

Question 4

External layer of hair

Answer 4

Is completely dead

Question 5

Layers of hair follicle

Answer 5

Internal root sheath, external root sheath, glassy membrane

Question 6

Functions of hair

Answer 6

Protection, sensory input, thermoregulation, communication

Question 7

Muscle each hair root is connected to

Answer 7

Arrector pili (adds insulation, ie goose bumps)

Question 8

Phases of hair growth

Answer 8

Anagen, catagen, telogen

Question 9

Anagen phase

Answer 9

Cells divide rapidly at the root which pushes the hair shaft up and out. This takes 2 to 7 years

Question 10

Catagen

Answer 10

Transitional phase where growth stops and external root sheath attaches to the root of the hair

Question 11

Telogen

Answer 11

Hair follicle is at rest, lasts for about 2 to 4 months and then anagen begins again