Earthworm Anatomy Quiz

1. Which combination most directly creates the earthworm's hydrostatic support system?

2. An earthworm has damage to the organ that uses muscular action and swallowed grit to break food into smaller particles. Which function would be most directly reduced?

3. Food has just entered through the mouth and is being drawn farther into the digestive tract by a strong muscular region. Which organ is performing this action?

4. A thin internal membrane separates one body segment from the next. What is this membrane called?

5. After food passes through the gizzard, where do most chemical digestion and nutrient absorption occur?

6. Which digestive organ temporarily stores swallowed material before it is mechanically ground?

7. During a dissection, you observe a fold projecting into the intestinal cavity. Which structure is it?

8. Which observation best reflects the earthworm's closed circulatory system?

9. Undigested material has traveled through the full length of the intestine. Through which structure does it leave the earthworm?

10. An earthworm struggles to move across a surface because it cannot anchor parts of its body while its muscles contract. Which structures are failing to provide traction?

11. Damage to a longitudinal structure on the ventral side prevents nerve signals from traveling efficiently between distant segments. Which structure was most likely damaged?

12. Several muscular vessels loop around the esophagus and help move blood between major longitudinal vessels. What are they commonly called?

13. If the organs that filter coelomic fluid and remove metabolic wastes stopped functioning, which structures would be affected?

14. Which longitudinal circulatory structure lies along the dorsal side of the digestive tract?

15. During reproduction, which external structure secretes material that helps form the cocoon?

16. Which reproductive structures receive and store sperm obtained from a mating partner?