The circulatory system in the earthworm
A) Is absent since all respiration is across the epidermis
B) Is an open system where hemolymph washes through body sinuses
C) Has a dorsal vessel as the main pumping organ
D) Has no pumping structure but depends on the action of body muscles to move the blood
E) Has five pumps that circulate blood first to the gills and then to the rest of the body

Question

Quizplus · Accepted Answer

The circulatory system in the earthworm is an open system where the hemolymph (equivalent to blood) washes through body sinuses. The dorsal vessel acts as the main pumping organ, pushing the hemolymph to the front of the worm, after which it returns toward the posterior end.

The Circulatory System in the Earthworm