In a ___________ circulatory system,the circulating fluid,blood,is always enclosed within the blood vessels that transport blood away from and back to a pump.
A)closed
B)open
C)countercurrent
D)reversible

Question

Quizplus · Accepted Answer

A closed circulatory system is characterized by blood being enclosed within blood vessels that transport it to and from a pump, usually the heart. This is in contrast to an open circulatory system, in which blood is not always enclosed within vessels and may instead wash over tissues directly. Countercurrent and reversible circulatory systems are not types of circulatory systems, but rather specific mechanisms within certain types of circulatory systems.

In a ___________ Circulatory System,the Circulating Fluid,blood,is Always Enclosed Within