Which of the following is NOT a constituent of an open circulatory system?
A) hemolymph
B) internal cavities
C) a heart
D) capillaries
E) all of these are constituents of an open circulatory system

Question

Quizplus · Accepted Answer

Capillaries are not a constituent of an open circulatory system. In an open circulatory system, hemolymph (a fluid similar to blood) bathes the organs directly and is transported through internal cavities, but there is no system of capillaries connecting the blood vessels. A heart may be present to pump the hemolymph, but it is not always necessary. Therefore, the correct answer is D.

Which of the Following Is NOT a Constituent of an Open