Vocabulary
______________ is a type of fibrous protein that makes up the majority of the cortex of the hair.
a) medulla
b) cuticle
c) keratin
d) none of these choices
c) keratin
The cuticle scales of the hair always point towards the:
a) root
b) medulla
c) tip of the hair
d) follicle
c) tip of the hair
The tough outer covering of a hair composed of overlapping scales is called the
a) cuticle
b) medulla
c) cortex
d) none of the above
a) cuticle
The period of active hair growth is called the ____________ stage
a) catagen
b) telogen stage
c) anagen stage
d) imagen stage
c) anagen stage
The central core of hair fiber is called the _________
a) keratin
b) cortex
c) cuticle
d) none of the above
d) none of the above (Medulla)
Although variations can occur, which of the following best describes northern European hair?
a) kinky with dense, unevenly distributed pigment
b) straight with evenly distributed granules
c) round cross section with a large diameter
d) coarse with a thick cuticle and a continuous medulla
b) straight with evenly distributed granules
A compound microscope that allows the side-by-side comparison of samples, such as of hair or fibers is known as a ____________________.
Comparison Microscope
Which of the following is most likely a result of hair bleaching?
a) increased number of disulfide bonds
b) a yellowish tint to the hair
c) a more triangular cross section
d) thickened scales on the cuticle
Bits of pigment found in the cortex of the hair are known as ______________.
melanin granules
Neutron activation analysis can check for the presence of:
a) silver
b) DNA
c) water content
d) hair dye
a) silver