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Trace Evidence Analysis > Hair > Flashcards

Hair Flashcards

1
Q

Chemistry

A

Protein (keratin) - 65-95%
Water - 32% w/w

keratin is fibrous, sulphur- containing polyamides

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2
Q

What is the chemistry of hair in mammals

A

Alpha- keratin

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3
Q

What is the chemistry of hair in other vertebrates

A

Alpha and beta keratin

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4
Q

Chemical formula for human hair

A

Cysteine

Human hair contains 21amino acids

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5
Q

Cysteine

A

3D amino acid diner cpd composed of cysteine amino acides joined together by disulphide bonds

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6
Q

Influence of disulphide bond on the hair

A

Mechanical strength
Elasticity of hair
3D structure of cysteine

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7
Q

Hair degradation

A

Occurs in conditions including sunlight, weathering, bleaching, permanent waving

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8
Q

Hair is made up of 3 histological layers

A

Cuticle
Cortex
Medulla

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9
Q

Cuticle

A

Outermost layer
Provides chemical resistance to the hair
Protects the cortex

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10
Q

Cortex

A

Consists of fusiform
Responsible for structural integrity and mechanical properties
Contains pigment granules which are responsible for hair color

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11
Q

Cell membrane complex

A

Material between cortical and cuticle cells

Acts as an adhesive binding adjacent cells to each other

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12
Q

CMC in combination with endocuticle

A

Nonkeratinous region

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13
Q

Follicle

A

Site for hair growth

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14
Q

Follicle is composed of

A

Inner root sheath and outer root sheath

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15
Q

Inner root sheath of follicle is made up of 3 layers

A

Henle’s layer
IRS cuticle
Huxley’s layer

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16
Q

Hair cycle

A

Anagen
Catagen
Telogen

17
Q

Anagen

A

Active growing phase
High rate of mitosis
Hair extends outward from the skin whilst follicle extends to deepest position relative to skin surface

18
Q

Tissues keratinize and hydrates in the anagen phase

True/False

A

False

Tissues dehydrates

19
Q

What cells are produced in the anagen phase

A

Melanocytes
They produce pigment granules

Trace Evidence Analysis (2 decks)

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