The Advantage of the Double-Loop Circulatory Pathway of Some Vertebrates

question 8

Multiple Choice

The advantage of the double-loop circulatory pathway of some vertebrates over the single-loop circulatory pathway of fish is that

• A) the blood is put back under pressure after picking up oxygen in the respiratory organ.
• B) all the O ₂-rich blood is pumped to the systemic arteries of the body.
• C) the O ₂-rich blood and O ₂-poor blood mixes in the single ventricle.
• D) the ventricle acts as a strong pump.
• E) the atria act as receiving chambers.

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