In an open circulatory system,
A) hemolymph enters the heart via ostia.
B) blood leaves the heart via venules.
C) the heart has two or more chambers.
D) nutrients are exchanged across the walls of capillaries.
E) blood is pumped into cavities called ventricles.

Question

Quizplus · Accepted Answer

In an open circulatory system, hemolymph (a fluid equivalent to blood and interstitial fluid) is pumped by the heart through openings called ostia into the body cavity, where it directly bathes the organs and tissues, facilitating the exchange of nutrients, wastes, and gases. This system does not involve venules or capillaries as in closed circulatory systems, and the structure of the heart can vary widely among different organisms, not necessarily having multiple chambers or ventricles dedicated to pumping blood.

In an Open Circulatory System