Structures of the Hair Root
The dermal papilla is surrounded by the ____?
Hair Follicle
The hair shaft consists of ____ main layers
Three
The _____ accounts for about 90 percent of the total weight of the hair.
The cortex
Amino acids are made up of ____.
Elements
Three types of ____ bonds are hydrogen, salt, and disulfide bonds.
Side
Thioglycolate permanent waves and ____ chemical hair relaxers break disulfide bonds.
Hydroxide
The dermal papilla contains the blood and nerve supply that provides ____ needed for hair growth.
Nutrients
The ____ consists of a single overlapping layer of transparent, scale-like cells that look like shingles on a roof.
Cuticles
Hair that is missing the medulla are very fine and _____.
Naturally Blonde
The chemical composition of normal hair is ____ percent carbon.
51%
Disulfide bonds join sulfur atoms of the two neighboring ____ amino acids to create one cystine.
Cysteine
Natural hair color is the result of the ____ pigment found within the cortex.
Melanin
Sebum production is NOT affected by ____.
The hair feels ____ when you move your thumbs and fingers from its end to the scalp.
Rough
Protein makes up approximately _____ percent of human hair.
90%
Amino acids are joined ____ in a definite order by peptide bonds.
EndToEnd
____ bonds are easy broken by water or heat.
Hydrogen
Black and brown hair colors are provided by ____.
Eumelanin
The hair bulb forms what part of hair root?
Lower Part of the Hair Root
The cortex is the ____ layer of the hair.
Middle Layer
Hair ____ matures through a process called Keratinization.
Follicles
The polypeptide chains intertwine around each other to create the spiral shape of a coiled ____.
Proteins
Salt bonds depend on pH and account for ____ of the hair's total strength.
1/3 ( One Third)
Red and ginger to yellow and light blond hair colors are provided by ____.
Pheomelanin
The arrector pili is a minute, _____ in the skin attached to the base of the hair follicle.
Involuntary Muscle Fibers
Swelling the hair with high pH products raises the cuticle layer and opens the spaces between the ____.
Scales
Essential elements in human ____ are sulfur, carbon, oxygen, hydrogen, and nitrogen.
Hair
With in the _____, polypeptide chains are cross linked by side bonds.
Hair cortex
Disulfide bonds are the _____ side bonds in the cortex.(strength)
Weakest
What term can be described as straight, wavy, curly, or extremely curly.
Wave Pattern