properties of hair and scalp
properties of hair and scalp
properties of hair and scalp
properties of hair and scalp
properties of hair and scalp
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:
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 only be broken by:

What are chemical processes 

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
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