EARTHWORM :
The earthworm has two muscle types . The outer layer contains the circular muscles, which causes the worm to get long and thin when they contract. The inner layer are the longitudinal muscles, which cause the worm to get short and thick when they contract. This is because the worm’s body is filled with fluid, which is pushed around by the force created from the contractions. Then, in almost all of the segments of the earthworm’s body, there are setae. They hook into the ground and allow the worm to pull itself forward as its muscle groups contract and relax.
GRASSHOPPER :
The grasshopper has powerful flight muscles, which are fastened to the exoskeleton at the thorax. The joint muscles work in pairs, meaning when one muscle contracts, the other relaxes. The contraction results in a bending of the joint and the relaxation results in the extending of the joint. The grasshopper can jump 20 times its body length. Speaking of its body, there are three major divisions – the head, thorax, and abdomen.
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