"Stranding" in the Hall of Fame
the 2 parts of the strand of human hair
Root & shaft
This is at the base of the follicle and contains living cells that form the hair strand
Hair bulb
Why does hair grow in a whorl pattern
Hair leaves follicles at angles different from surrounding hair
How much of the human hair is made of carbon
51%
Broken by heat or water. Repaired by cooling or drying
Hydrogen bond
Parts of the hair shaft
Cortex - medulla - cuticle
This root structure supplies nutrients so hair can grow
bulb - dermal papilla - arrector pili - hair follicle
Dermal papilla
The thickness or diameter of the individual hair strand is called
Texture
The amount of carbon in the hair confirms that human hair is ORGANIC or INORGANIC
Organic
If you thermal curl hair and let it cool afterwards before styling, what bond are you allowing to repair
Hydrogen bond
Provides the strength, elasticity, and color of the hair
cuticle - cortex - medulla- fiber
Cortex
The skin or scalp that surrounds the root and anchors the hair in the skin
bulb - dermal papilla - arrector pili - hair follicle
bulb - dermal papilla - arrector pili - hair follicle
The number of hairs per square inch of scalp is called
Density
Disulfide bonds join which element atoms in the polypeptide chain
Sulfur
Broken by changes in pH. Weak, physical side bond
Salt bond
Medulla has two other names. What are they
Pith & Core
This gland produces sebum used to keep hair and skin soft
Sebaceous Gland
If you rub a strand from end to scalp, what are you analyzing?
porosity - elasticity - density - texture
porosity
What are the elements that make up hair
Carbon-Oxygen-Hydrogen-Nitrogen-Sulfur
Which sidebonds are physical bonds
Salt & Hydrogen
Protective layer that resembles shingles on a house or scales on a fish
Cuticle
All of the following a living portions of hair below the skin surface except:
Hair bulb - arrector pili muscle - hair follicle - dermal papilla
Arrector pili muscle (part of the skin structure, not hair structure)
3 phases of the hair growth cycle and what each of them do
Anagen: Growth
Catagen: transitional
Telogen: Shedding
List each of the major hair elements IN ORDER OF PERCENTAGE greatest to least
C: 51%, O: 21%, N: 17%, H: 6%, S: 5%
A long chain of amino acids linked by peptide bonds is called a __ chain
Polypeptide