The circulatory system of an earthworm circulates blood
A) by the pumping action of multiple four-chambered hearts.
B) by peristaltic waves generated by contraction of muscular blood vessels.
C) using an open circulatory system.
D) using one centrally located heart.
E) through the heart,to the lungs,back to the heart,and out to the systemic tissues.

Question

Quizplus · Accepted Answer

Earthworms have a closed circulatory system where blood is circulated by peristaltic waves generated by the contraction of muscular blood vessels, specifically the aortic arches, which act like hearts.

The Circulatory System of an Earthworm Circulates Blood