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1. What features of rats make them good experimental models to learn about facto

ID: 9587 • Letter: 1

Question

1. What features of rats make them good experimental models to learn about factors that affect humans?
2. What external features of rats are common to all mammals?
3. Give 2 examples of how mammals are diverse external characteristics.
4. Why do feet, pals, ears of rats not have hair?
5. What is the function of the pelage other than insulation?
6. Can you suggest a function for vibrissae?
7. How lon are the vibrissae in relation to the head and width of the body?
8. How to upper incisors mesh with the lower incisors?
9. Are any teeth other than incisors present?
10. Why is the mouth of a rat referred to as subterminal?
11. How does the position of the eyes of a rats head differ from that on a humans head?
12. What is the function of the large pinna in rats?
13. Are teats exclusively mammalian structures? Why do you think so?
14. What term similar to quadruped describes animals such as humans with two leg?
15. What digitigrade animals do you racall?
16. Are humans plantigrade or digitigrade?
17. How does contraction of muscles passing under the zygomatic arch move the manduble in rats?
18. What are the relative sizes of the braincases in humans and rats(measure circumference)?
19. What does the similarity between the skeletal system of rats and humans suggest about the ancestry of these two mammals?

Explanation / Answer

2. Teeth, hair, nails, mammary glands, sex organs, metabolic activities of rats are common to all mammals.

3. Mammals two external diverse characterisrtics are mammary glands and presence of hair, in additon to giving birth to young ones.

4. Feet, palms and ears of rat are devoid of hair, due to absence of hair follicles and glands responsible for them.

5. Function of the pelage other than insulation is protection from injury, recognition of partners, and coloration patterns.

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