Hair Analysis Review & Reinforcement

What are the 3 parts of the hair shaft?

• Follicle, Medulla, Keratin

• Cuticle, Color, Curl

• Cortex, Cuticle, Medulla

An investigator is excited to find a hair with the follicle attached when searching for evidence at a crime scene. Why might the investigator be excited?

• It cannot be used as individual evidence.

• The color is nice.

• The follicle contains DNA that can be tested.

Tags

NGSS.MS-LS3-1

What protein gives hair it's strength?

• amino acids

• keratin

• cortex

Tags

NGSS.MS-LS3-1

What is the function of the cuticle of the hair shaft?

• Protects the other layers of hair and provides strength.

• Gives hair its' color and structure.

• Provides characteristics unique to the hair.

What is the function of the medulla of the hair shaft?

• Protects the other layers of hair and provides strength.

• Gives hair its' color and structure.

• Provides characteristics unique to the hair.

What is the function of the cortex of the hair shaft?

• Protects the other layers of hair and provides strength.

• Gives hair its' color and structure.

• Provides characteristics unique to the hair.

All of these are examples of microscopic properties of hair EXCEPT:

• cuticle structures

• length

• medulla pattern

• specific color of hair

All of these are examples of macroscopic properties of hair EXCEPT:

• texture

• length

• medulla pattern

• color (not specific)

If hair grows at a rate of approximately 0.44 mm per day and measures 40 mm from follicle to tip, approximately how many days has it been growing?

• 11 days

• 75 days

• 9 days

• 90 days

What is the medullary index for the following hair? Medulla diameter: 58 microns Cortex diameter: 110 microns

• 0.52 microns

• 1.9 microns

• 2.5 microns