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Q: Which statement regarding the mammalian heart is correct?

  • 1
    Blood is pumped from the heart via the atria.
  • 2
    Oxygen-loaded blood moves only through the right side of the heart.
  • 3
    When the right atrium contracts, it forces blood into the left atrium.
  • 4
    In the adult heart, blood in the right chambers of the heart cannot enter the left chambers without passing through the lungs.
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Answer : 4. "In the adult heart, blood in the right chambers of the heart cannot enter the left chambers without passing through the lungs."
Explanation :

Answer: D) In the adult heart, blood in the right chambers of the heart cannot enter the left chambers without passing through the lungs. Explanation: In the adult heart, blood in the right chambers of the heart cannot enter the left chambers without passing through the lungs is correct regarding mammalian heart.

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