1.Approximately how many segments did the whole earthworm have?
96
2. What is the function of the clitellum, the only organ visible externally on earthworms?
3. It secretes mucus that is important in reproduction
The
...
1.Approximately how many segments did the whole earthworm have?
96
2. What is the function of the clitellum, the only organ visible externally on earthworms?
3. It secretes mucus that is important in reproduction
The worm alternates between extension and pulling the rest of its body after the extension. It extends the
front of its body by contracting its circular muscles making itself _long and thin__. It pulls the rest of its
body by contracting its longitudinal muscles, making itself Short and fat.
4. What extends when the front of the earthworm extends and guides the direction in which the
earthworm moves?
The prostomium
5. How did the earthworm's mode of location compare to the nematode's mode of location?
The earthworm contracted and extended, where as nematode moves side to side
6. Which of the following is a correctly labeled image of an earthworm's internal anatomy in cross
section?
11. On what side of an earthworm are the setae located and how does that location connect to their
function?
Ventral, because they provide traction during locomotion so they need to be underneath the worm
12. Which of the following is a correctly labeled image of an earthworm’s internal anatomy in longtudinal
anterior section?
13. Which of the following is a correctly labeled image of an earthworm’s internal anatomy in longitudinal section?
14. Does the fact that you were only able to identify seminal vesicles in the earthworm longitudinal
section slide indicate that the earthworm you examined is male? Why or why not?
No earthworms produce eggs and sperm, the ovaries are just too small to see
15. Which of the following is a correctly labeled image of an earthworm’s digestive system in a
longitudinal section?
16. Why does the gizzard have more musculature than the crop?
The gizzard macerates and crushes food. The crop mostly stores food
17. What are the structures shown in this picture? Septa
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