hair and scalp properties

Question 1

trichology

Answer 1

the study of hair and hair diseases

Question 2

hair root

Answer 2

located below the epidermis

Question 3

hair shaft

Answer 3

above the epidermis

Question 4

living parts of hair

Answer 4

hair follicle, hair bulb, and dermal papilla

Question 5

hair follicle

Answer 5

skin surrounding the the hair root and anchors the hair into the skin

Question 6

hair bulb

Answer 6

contains living cells that will form the hair strands

Question 7

dermal papilla

Answer 7

contains blood vessels that supply nutrients that allow hair to grow

Question 8

cortex

Answer 8

responsible for hairs strength elasticity,and color. 90% of hairs weight

Question 9

hair density

Answer 9

individual strands of hair on 1 square inch

Question 10

hair elasticity

Answer 10

the hairs ablity to stretch and return to its original length without breaking

Question 11

laungo hair

Answer 11

short fine hair that covers a fetus

Question 12

Venus hair

Answer 12

short fine unpigmented body hair

Question 13

terminal hair

Answer 13

long pigmented hair on scalp and body

Question 14

catagen phase

Answer 14

brief transitioning period between the hair follicles growth and resting phase. the police canal shrinks and detaches from the dermal papilla. less than 1% of hair is in this stage at any time. last one to two weeks.

Question 15

telogen

Answer 15

resting phase. either sheds or remainds in place untill the next anagen phase pushes it out. a little less than 10% of hair is in this phase at any time

Question 16

amino acids

Answer 16

form the building blocks of proteins. link together end to end by strong chemical peptide bonds to form the polypeptide chain that comprises proteins

Question 17

cysteine

Answer 17

amino acid with a sulfur atom that joins together two peptide strands

Question 18

disulfide bonds

Answer 18

strong chemical side bond that join the sulfur atoms of two neighboring cysteine amino acids to created one cysteine which join together two polypeptides strands like rungs on a ladder

Question 19

hydrogen bonds

Answer 19

weak physical cross-link side bond that is easily broken by water or heat

Question 20

lanthionization bonds

Answer 20

bonds created when disulfide bonds are broken by hydroxide chemical hair relaxers

Question 21

peptides bonds

Answer 21

(end bonds) chemical bond that joins amino acids to each other end to end to form a polypeptide chain

Question 22

polypeptide chains

Answer 22

long chain of amino acids linked together by peptide bonds

Question 23

salt bonds

Answer 23

weak physical cross-linked side bonds between adjacent polypeptide chains that is broken by changes in ph

Question 24

side bones

Answer 24

bonds that cross-link polypeptied chains and are responsible for the extrem strength and elasticity of human hair. one third of overall strength of hair

Question 25

round cross-section

Answer 25

straight hair

Question 26

oval to round cross-section

Answer 26

wavy or curly hair

Question 27

elliptical cross-section

Answer 27

very curly hair (coily)