What Prevents Oxygen-Rich Blood from Mixing with Oxygen-Poor Blood in the Heart

question 10

Multiple Choice

What prevents oxygen-rich blood from mixing with oxygen-poor blood in the heart?

• A)The tricuspid valve
• B)The fibrous pericardium
• C)The aortic and pulmonary semilunar valves
• D)The interatrial and interventricular septa
• E)The intercalated discs

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