Suppose that the circular muscles in an earthworm have become selectively paralyzed such that they are not able to contract. How will this affect the earthworm's locomotion?
A) The earthworm will be able to elongate, but not get thicker.
B) The earthworm will be able to get thicker, but not elongate.
C) The earthworm will not be able to elongate or get thicker.
D) The earthworm will be able to crawl as normal.

Question

Quizplus · Accepted Answer

The circular muscles in an earthworm are responsible for elongating the body by contracting and making the worm thinner. If these muscles are paralyzed, the earthworm will not be able to elongate, but it can still get thicker by contracting its longitudinal muscles.

Suppose That the Circular Muscles in an Earthworm Have Become