Chapter 3 Test

Question 1

What are the two parts of a hair?

Answer 1

The follicle and the shaft

Question 2

What are the layers of a hair shaft?

Answer 2

The cuticle the cortex and the medulla

Question 3

The largest part of the hair shaft is…

Answer 3

The cortex

Question 4

What type of evidence is hair considered?

Answer 4

Class if it is just the shaft. Class and individual if the shaft has the follicle still there

Question 5

Know what is meant by secondary transfer

Answer 5

Hair that is left behind at a crime scene can adhere to clothes, carpets, and other surfaces and be transferred to another location. Point A to Point B to Point C

Question 6

When did hair become important for analysis purposes?

Answer 6

In the late 1800s

Question 7

1883 text on forensic science called The Principals and Practice of Medical Jurisprudence

Answer 7

Alfred Swaine Taylor and Thomas Stevenson, contain chapters on using hair in forensic investigations including drawings of human hair under magnification and identification of the various parts of human hair, and references cases in which hair was used as evidence in England

Question 8

Comprehensive study on the hair of man and animals in 1910

Answer 8

Published by the French forensic scientists Victor Balthazard and Marcelle Lambert, and includes numerous microscopic studies of hairs from most common animals.

Question 9

When did the comparison microscope start to be used for hair purposes?

Answer 9

Its first use was in 1934, advancements continued throughout the 20th century

Question 10

What is the purpose of hair on mammals?

Answer 10

Helps regulate temperature, reduces friction protects skin from the light, and is a sense organ

Question 11

Approximately how many hair follicles are on a newborn baby, and how many are on the head

Answer 11

Babies have 5 million hair follicles, and only 2 percent are on the head, 100000.

Question 12

Hair viewed for forensic investigations is studied both macroscopically and microscopically, what are the characteristics of macroscopic

Answer 12

Length, color, and curliness are macroscopic characteristics as hair from the scene and hair from the 6 regions can be compared and determine if the hair is human or not.

Question 13

Incandescent

Answer 13

When light is emitted as a result of being heated up

Question 14

Effervescence

Answer 14

Giving off a bubbles/fizzy

Question 15

Fluorescent

Answer 15

Glow, when something contains certain chemicals it will absorb some of the light from the specific wavelength and re-emit light of a different wavelength, ultra-violet light

Question 16

Different types of toxins that can be absorbed or ingested in the skin which then can move to the hair

Answer 16

Arsenic, lead, and many drugs including opioids, heroin, meth

Question 17

Hair grows at what rate per month

Answer 17

1.3 cm

Question 18

What are the differences between animal hair and human hair?

Answer 18

Animal hair has a bigger medullary index of 0.5 or more compared to a human 0.33, its cuticle can be coronal or spinous and humans can only be imbricate, animal hair also has pigments found in solid masses called ovoid bodies while human hair is usually one color

Question 19

How many types of hair?

Answer 19

6, head, eyebrows and eyelashes, beard and mustache, underarm, body, and pubic

Question 20

How many stages does hair go through?

Answer 20

3, anagen (growth), catagen (resting), telogen (dormancy)

Question 21

Know the definition of imbricate

Answer 21

Cuticles that are flattened and narrow

Question 22

Know what locards principle of exchange is

Answer 22

Contact between people and objects during a crime can result in a transfer of material resulting in trace evidence.