📊 Biology
Q. Which statement regarding the mammalian heart is correct?
  • (A) Blood is pumped from the heart via the atria
  • (B) Oxygen-loaded blood moves only through the right side of the heart
  • (C) When the right atrium contracts, it forces blood into the left atrium
  • (D) In the adult heart, blood in the right chambers of the heart cannot enter the left chambers without passing through the lungs
✅ Correct Answer: (D) 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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