Which of the Following Is Not an Advantage of Having

Multiple Choice

Which of the following is not an advantage of having separate pulmonary and systemic circuits for birds and mammals?

A) It prevents mixing of blood high in oxygen with blood low in oxygen.
B) It maximizes respiratory gas exchange.
C) It allows shunting of blood during diving.
D) The two circuits can operate at different pressures.
E) Blood with the highest oxygen content always enters the systemic circuit.