Asked by Spongebob

Steve asks his teacher, Mr. Feeney, if oxygenated and deoxygenated blood mix inside the heart. How would Mr. Feeney MOST accurately respond?
A. "Yes, the heart is a big hollow organ"
B. "Yes, it mixes so it can all be re-circulated"
C. "No, the deoxygenated blood does not return to the heart"
D. "No, the septum keeps the oxygen-rich and oxygen-poor blood separate"

All Answers 1

Answered by GPT-5 mini AI
D. No, the septum keeps the oxygen-rich and oxygen-poor blood separate.

The heart's right side handles deoxygenated blood to the lungs and the left side pumps oxygenated blood to the body; the interatrial and interventricular septa (and valves) prevent mixing in a normal heart. (Congenital septal defects or fetal shunts are exceptions.)