Hair

Question 1

Important cells for development of hair folliclues

Answer 1

stem cells in bulge region

dermal papilla cells

Question 2

first layer to become keratinized

Answer 2

Henle’s

Question 3

Huxley layer contains ______ and serves as

Answer 3

trichohyalin granules

substrate for citrulline-rich proteins in hair follicle

Question 4

main constituents of hair fibers

Answer 4

sulfur-rich proteins
lipids
water
melanin

Question 5

epicuticle is made of, and is considered first _____

Answer 5

hydrophobic lipid layer of 18-methyleicosanoid acid on surface of fiber

first hydrophobic defense

Question 6

component of hair that contributes to strength and elasticity

Answer 6

cortex

Question 7

cortex consists of

Answer 7

cortical cells rich in keratin filaments

amorphous matrix of sulfur proteins

Question 8

shape, stability, and resilience to hair shaft is afforded by

Answer 8

cysteine residues in adjacent keratin filaments of cortical cells, which form covalent disulfide bonds

Question 9

constituents of human type II hair keratin

Answer 9

Group A: hHb1, hHb3, hHb6

Group C: hHb2, hHb4, hHb5

Question 10

keratin types expressed in early stages of differentiation in matrix and cuticle cells

Answer 10

hHb2, hHb5

Question 11

At advanced stage of differentiation, cortical cells express

Answer 11

hHb1, hHb3, hHb6