Download Ch 5 - Phillips Scientific Methods

Hair Questions
Name:________________________ # ______
Use your book to answer the following:
1.
The three layers that comprise the hair shaft are _____________,
_____________________, and ________________.
2. The scales of most animal hairs can be described as having the appearance of
shingles on a roof. (true, false)
3. Compare the cuticle of a human hair and animal hair.
4. The ________________ contains the pigment granules that impart color to hair.
5. What are the air sacs of a hair found in a hair called?
What
region of the hair shaft are they in?
6. The central canal running through many hairs is known as the
____________________.
7. Human head hairs generally exhibit (continuous, absent) medullae.
8. Compare general medulla patterns between a human and an animal.
9. The 3 stages of hair growth are ________________, __________________, and
__________________.
10. Which growth phase is the longest?
11. A single hair (can, cannot) be individualized to one person by microscopic
examination.
12. In making hair comparisons, it is best to view the hairs side by side under a
_______________ microscope.
13. Explain the chemistry of the keratin molecule. I expect you to show your knowledge
here!
14. Explain how the 3 possible shapes of hair are related to cross sections.
15. Define undulation.
16. How can hair be used as a chemical indicator?
17. If evidence of a particular drug is found 6 cm from the root, approximately how long
ago was the drug used?
18. Where can DNA be found in a hair?
19. Approximately how many hairs do we each lose a day?
20. How can you tell if a hair was forcibly removed?