Show:
Structure of hair
Layers and muscles
Parts of hair
science of hair
all about bonds
100
the scientific study of the hair, its diseases, and its care is called:
What is trichology
100
the blood and nerve supply that provides nutrients needed for hair growth are contained in the:
What is dermal papilla
100
generally, only thick, coarse hair contains a:
What is medulla
100
as living cells of the hair mature, they fill up with protein called:
What is keratin
100
there are 3 different types of side bonds in the cortex:
What is hydrogen, salt, and disulfide bonds
200
the two main divisions of the hair are the hair root and the:
What is hair shaft
200
the tiny involuntary muscles in the skin that contracts and causes "goose bumps" is the:
What is arrector pili
200
about 90% of the total weight of hair comes from the:
What is cortex
200
the elements that make up the amino scids in hair are carbon, nitrogen, hydrogen,:
What is oxygen and sulfur
200
the strongest side bonds in the cortex are the:
What is disulfide bonds
300
the 3 main structures associated with the hair root are the follicle, the bulb, and the:
What is dermal papilla
300
the oily substance called sebum is secreted by the:
What is sebaceous glands
300
liquids can penetrate the hair only when the __is raised.
What is cuticle
300
of the 5 elements in human hair, the element that makes up the highest percentages is:
What is carbon
300
a dislfide bond joins the __ atoms of wo neighboring cysteine amino acids to create cystine.
What is sulfur
400
the hair root is contained in a tube-like depression, or pocket, in the skin known as the:
What is follicle
400
the 3 layers of the hair shaft are the cuticle, cortex and:
What is medulla
400

in order to penetrate the cuticle layer and reach the cortex, oxidation haircolors, perm solutions, and chemical relaxers must have___________ PH

What is an alkaline pH

400
the chemical bonds that join amino acids to each other are called:
What is a peptide bonds
400

disulfide bonds can be broken by:

Chemicals

500
the club-shaped structure that forms the lower part of the hair root is the:
What is hair bulb
500
the layer of the hair shaft that protects it from penetration and damage is the:
What is cuticle
500
the changes that take place in the hair during permanent waving, chemical relaxing, and oxidation hair coloring occur in the:
What is cortex
500
the bonds that account for the strength and elasticity of hair are the:
What is side bonds
500
a hydrogen bond is a physical side bonds that is easily broken by:
What is water or heat