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The scientific study of hair, its diseases and care is called:

A. dermatology
B. trichology
C. biology
D. cosmetology

B. trichology

1

The two parts of a mature hair strand are the hair shaft and:

A. dermis
B. hair follicle
C. hair root
D. hair ends

C. hair root

2

The portion of hair that projects above the skin is the:

A. dermal papilla
B. hair shaft
C. hair root
D. follicle

B. hair shaft

3

The follicle, bulb, papilla, arrector pili muscle and subaceous glands are main structures of the:

A. hair shaft
B. sudoriferous glands
C. cortex layers
D. hair root

D. hair root

4

The tubelike depression or pocket in the skin or scalp that contains the hair root is the:

A. follicle
B. shaft
C. bulb
D. scalp

A. follicle

5

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

A. forehead area
B. elbow area
C. soles of the feet
D. aback of the neck

B. elbow area

6

The follicle extends downward from the epidermis, where is surrounds the:

A. epidermis layer
B. dermal papilla
C. hair root
D. hair shaft

C. Hair root

7

The lowest area or part of the hair strand is the:

A. hair bulb
B. hair shaft
C. arrector pili
D. sebaceous gland

A. hair bulb

8

A small, cone-shaped area at the base of the hair follicle that fits into the hair bulb is the:

A. sweat pore
B. hair follicle
C. dermal papilla
D. lymph gland

C. dermal papilla

9

A tiny, involuntary muscle fiber inserted in the base of the hair follicle is the:

A. dermal papilla
B. arrector pili
C. lanugo hair
D. hair bulb

B. arrector pili

10

The oil glands of the skin connected to the hair follicles are:

A. sweat glands
B. dermal papilla
C. sebaceous glands
D. hair streams

C. sebaceous glands

11

An oily substance secreted from the sebaceous glands is:

A. sweat
B. medulla
C. sebum
D. salt

C. sebum

12

The overlapping layer of hair with transparent, scalelike cells is the:

A. bulb
B. follicle
C. cuticle
D. medulla

C. cuticle

13

The three main layers of the hair shaft are the cuticle, medulla and:

A. cortex
B. shaft
C. root
D. bulb

A. cortex

14

Swelling the hair raises the cuticle layer and allows for:

A. primary defense
B. penetration
C. cross sections
D. growth phase

B. penetration

15

For chemicals to penetrate a healthy cuticle hair layer, they must:

A. expose the mantle layer
B. stiffen the hair shaft
C. have an alkaline ph
D. remove the cuticle layer

C. have an alkaline pH

16

The fibrous protein core of the hair, formed by elongated cells containing melanin pigment, is the:

A. lower follicle
B. cortex layer
C. vellus hair
D. dermal papilla

B. cortex layer

17

The medulla is the innermost layer of the hair and is composed of:

A. oval cells
B. round cells
C. coarse hair
D. hair follicles

B. round cells

18

Hair is composed of a protein that grows form cells originating within the:

A. hair shaft
B. hair follicle
C. amino acids
D. main elements

B. hair follicle

19

The process whereby living cells mature and begin their journey up the hair shaft is:

A. simplicity
B. scalp
C. keratinization
D. medulla

C. keratinization

20

The five main elements that make up the chemical composition of human hair are carbon, oxygen, hydrogen and:

A. protein and amino
B. cells and keratin
C. elements and protein
D. nitrogen and sulfur

D. nitrogen and sulfur

21

The chemical bonds that hold together the amino acid molecules are:
A. convex bonds
B. peptide bonds
C. hydrogen drops
D. protein cells

B. peptide bonds

22

An end bonds is also known as a(n):

A. molecule bond
B. chain bond
C. peptide bond
D. elastic bond

C. peptide bond

23

When peptide bonds hold together a very long chain of amino acids, it is called a:

A. polypeptide chain
B. hydrogen chain
C. COHNS bond
D. elasticity bond

polypeptide bond

24

The three types of cross-links that form the bonds between the polypeptide chains are hydrogen bonds, salt bonds and:

A. disulfide bonds
B. water bonds
C. nitrogen bonds
D. elastic bonds

A. disulfide bonds

25

A weak type of physical side bond that is easily broken by water or heat is a(n):

A. amino acid
B. peptide chain
C. single bond
D. hydrogen bond

D. hydrogen bond

26

A salt bond is easily broken with the use of:

A. several acidic solutions
B. conditioning treatments
C. strong alkaline or acidic solution
D. thermal styling techniques

C. strong alkaline or acidic solutions

27

Bonds that must be chemically separated are:

A. disulfide bonds
B. sulfur bonds
C. cross links
D. porosity

A. disulfide bonds

28

Hydrogen chemical hair relaxers break disulfide bonds and during rinsing convert them to:

A. COHNS bonds
B. protein bonds
C. sebum bonds
D. lanthionine bonds

D. lanthionine bonds

29

The natural hair pigment found in the cortex layer of the hair is:

A. melanin
B. tissue
C. protein
D. brown

A. melanin