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) ________.

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The best choice would be a four-chambered heart as it allows for separate pulmonary and systemic circulations, meaning the blood pressure in the capillaries of the gas-exchange surface and in the capillaries of the general body circulation can be adjusted independently. A two-chambered heart (C) would also have separate systemic and pulmonary circulations, but the blood pressure could not be adjusted independently. An open circulatory system (A) and haemocoel (B) do not have separate circulations and thus cannot independently adjust blood pressure in different areas.

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