To adjust blood pressure independently in the capillaries of the gas-exchange surface and in the capillaries of the general body circulation, an organism would need a(n) ________.
A) open circulatory system
B) hemocoel
C) two-chambered heart
D) four-chambered heart

Question

Quizplus · Accepted Answer

The four-chambered heart allows for separate circuits to pump oxygenated and deoxygenated blood, which can be adjusted independently in the capillaries of the gas-exchange surface and the general body circulation. An open circulatory system or hemocoel does not have the necessary separation of circuits, and a two-chambered heart would not be efficient for maintaining different blood pressures in different parts of the body.

To Adjust Blood Pressure Independently in the Capillaries of the Gas-Exchange