When a clown at a birthday party squeezes a long balloon to twist it into a poodle or a hat, the volume of air inside the balloon stretches the balloon and extends its length and stays constant.This example is analogous to the action of muscles on the
A) endoskeleton.
B) hydrostatic skeleton.
C) spandrel skeleton.
D) exoskeleton.
E) tendril skeleton.

Question

Quizplus · Accepted Answer

The scenario given in the question is analogous to the action of muscles on a hydrostatic skeleton. Just like the balloon, in hydrostatic skeleton, a fluid-filled cavity (similar to the air inside the balloon) is surrounded by muscles that compress and extend the cavity, creating movement in the body part. The volume of the fluid remains constant, just like the volume of air inside the balloon.

When a Clown at a Birthday Party Squeezes a Long