Which Statement Describes an Open Circulatory System

Question

Which statement describes an open circulatory system?
A) It allows blood to be contained in blood vessels.
B) It contains two circulatory systems.
C) It is more efficient than a closed system.
D) It allows hemolymph and interstitial fluids to be mixed together.

Accepted Answer

In an open circulatory system, the circulating fluid (hemolymph) is not entirely contained within blood vessels but is allowed to flow freely within the body cavity, where it comes into direct contact with the body's tissues and organs, mixing with the interstitial fluid.