How Is It Possible to Have Two Separate Circulatory Systems

question 15

Multiple Choice

How is it possible to have two separate circulatory systems (pulmonary and systemic) ?

• A) The pulmonary arteries and veins reverse their function at the heart so that the pulmonary veins carry oxygenated blood and the pulmonary arteries carry deoxygenated blood.
• B) The heart is really two separate pumps; circulation to the lungs needs one pump, whereas circulation to the body needs a separate pump.
• C) The two systems are separate to prevent mixing of oxygenated and deoxygenated blood, which would cause the oxygen level to drop too low.
• D) The two systems are not truly separate; circulation of a specific sample of blood to the lungs occurs only after it has traveled through the body. It is one continuous system.

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