category 1
A tuft of hair standing straight up is known as a _____.
cowlick
During which phase is new hair produced?
Anagen
Which type of hair usually often has low elasticity, breaks easily, and has a tendency to knot, especially on the ends?
Extremely straight
What term can be described as straight, wavy, curly, or extremely curly?
Wave pattern
Salt bonds depend on pH and account for ____of the hair's total strength.
one-third
The result of follicles being arranged and sloping in a uniform manner is called _____.
a hair stream
At any given time, about ____ percent of scalp hair is in the anagen phase.
90
Asians and Native Americans tend to have ____ hair.
extremely straight
Natural hair color is the result of the ____pigment found within the cortex.
melanin
____ side bonds are easily broken by water or heat.
Hydrogen
During the ____phase, the hair is either shed or remains in place until it is pushed out by the growth of a new hair.
telogen
During the _____phase, the hair bulb disappears.
catagen
African Americans tend to have ____ hair.
extremely curly
Thioglycolate permanent waves and ____ chemical hair relaxers break disulfide bonds.
hydroxide
The three types of ____ bonds are hydrogen, salt, and disulfide bonds.
side
Hair growth is not increased by any of the following except ____.
the time of the year
The average growth rate of healthy hair on the scalp is about 1/2 ____.
inch per month
Red and ginger to yellow and light blonde hair colors are provided by ____.
pheomelanin
Disulfide bonds join the sulfur atoms of two neighboring _____ amino acids to create one cystine.
cysteine
Within the ____, polypeptide chains are cross-linked by side bonds.
hair cortex
Terminal hair is found on ____.
the arms
Vellus, or lanugo, hair is ____ and in adults is found in places normally considered hairless.
short and fine.
Black and brown hair colors are provided by ____.
eumelanin
Disulfide bonds are the ____ side bonds in the cortex.
strongest
The polypeptide chains intertwine around each other to create the spiral shape of a coiled ____.
protein