chapter 3-4
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| What is keratin | a protein in keeping hair strong and flexible
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| what is the rate of human hair growth | 1.3 cm per month
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| Describe the 3 stages of hair growth in detail | Anagen Phase- active growth phase; Catogenic Phase- hair grows and transitions; Telogenic Phase- resting phase and hairs are lost in this phase
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| Distinguish between European, Asian, and African hair | European- generally straight or wavy, pigment distributed small;
Asian- straight, pigment densely distributed;
African- kinky, curly, or coiled, pigment densely distributed
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| What are the three parts of the shaft of the hair | cuticle, cortex, medulla
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| How do the scales on the cuticle normally point | they overlap each other
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| How do the scales on the cuticle point when drugs have been ingested | from proximal to distal end
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| Name and describe the three types of scale patterns | Coronal- often resemble a stack of paper cups;
Spinous- triangular in shape and protrude from the shaft;
Imbricate- flattened and narrowed
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| What is the medullary index | the fraction of the hair shaft's diameter that the medulla occupies
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| What is the effect of bleaching on the hair | Removes pigment granules and gives hair a yellowish color, makes hair brittle and disturbs scales on cuticle
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| What is the importance of the root in forensics | it has DNA on it
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| 5 types of medullas | Continuous- one unbroken line;
Interrupted- pigment broken at regular intervals;
Fragmented- pigment line unevenly spread;
Solid- fills whole area;
Absent- no separate pigmentation
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| Why do CSI's need 25-50 hairs | to be considered adequate to represent the range pf hair characteristics of that individual
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| What can be determined from hair | If the source is human or animal, race, whether the hair was forcibly removed, if the hair has been treated with chemicals
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| How does human hair differ from animal hair | pattern of pigmentation, meduallary index, cuticle type
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| What is the importance of fibers in criminal cases | it can link a crime and a suspect
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| How can fibers be identified | microscope, burn test
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| Distinguish between natural and synthetic fibers | natural- come from animals, plants, and minerals that are mined from the ground
synthetic- fake fibers or regenerated fibers and polymers.. ex polyester, nylon, acrylic
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| Three types of natural fibers | plant-cotton; animal- hair, fur, webbing-ex- fur, silk, wool
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| Why should care be taken when collecting hairs and fibers | because you don't want to lose valuable evidence
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| Name 5 characteristics of fibers that can be identified using a microscope | type of fiber,
color of fiber,
where it was found
, what type of crime was committed,
time between crime and discovery of fiber.
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