Earthworms have no skeleton but during burrowing, the anterior end becomes turgid and acts as a hydraulic skeleton.This is due to:
Correct answer: C. Coelomic fluid
- A. Gut peristalsis
- B. Setae
- C. Coelomic fluid
- D. Blood
Explanation
The hydraulic skeleton is the system of support found in soft-bodied invertebrates which relies on the incompressibility of fluids contained within the body cavity. In earthworms the coelomic fluid is under pressure within the coelom and therefore provides support for internal organs. Due to the hydraulic skeleton, during burrowing, the anterior end becomes turgid and aids in the relaxation of longitudinal muscles.
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