Is there ever a hole or passageway between the two atria of the heart? Why or why not?
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Answer:
Yes, there is one before birth.
Explanation:
The fetus doesn't use her lungs. Since the normal blood flow to the lungs to pick up oxygen and back to deliver oxygen to the body is unnecessary.
The foramen ovale allows the blood to flow from the left atrium to the right. This bypasses the majority of the pulmonary circulation.
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