Hair Facts Part 1
what percentage of human hair is located on the head?
2%
How many types of hair are there on the body (according to the text)
6
one unbroken line of color
_____________________
continuous
Inner core of the hair
medulla
part of the hair above the follicle; contains mitochondrial DNA
hair shaft
what is a characteristic of mammals?
They have hair, live birth, self regulate temperature
How many cm does hair grow per month?
1.3 cm per month
No separate pigment in the medulla
None
This provides pigment or color to the hair (also eyes and skin)
melanin
a type of fibrous protein that makes up the majority of the cortex of a hair
keratin
True or false - the medulla in animals has a smaller diameter than human hair medulla
FALSE
approximately how many days do you keep a hair before it falls out
1000 days
pigmented area filling both the medulla and the cortex
solid
the outside of the hair - the surface that has scales and protects the hair
cuticle
a method of separating chemicals to establish their quantities
gas chromatography
True or False: drugs will show up in your hair
TRUE
What does bleaching do to hair?
pigmented line broken at regular intervals
interrupted or intermittent
the largest part of the hair shaft in humans and contains most of the melanin granules
cortex
genetic material in the nucleus of a cell
nuclear DNA
True or false: human hairs have flat overlapping scales
TRUE
What is one function of hair?
Answers vary
pigmented line unevenly spaced
fragmented or segmented
the root or base of the hair where DNA is located
follicle
bits of pigment found in the cortex of the hair
melanin granules