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Q: Which of the following events takes place during diastole in the human heart?
  • A. Blood enters the aorta
  • B. Blood enters the lungs
  • C. Blood leaves the ventricle
  • D. Blood enters the ventricle
Correct Answer: Option D - Systole and diastole are two phases of the cardiac cycle. Systole occurs when the heart contracts, while diastole takes place when the heart relaxes after contraction. During diastole, when heart muscle is relaxed, the blood flows freely through the atria and owing to the low pressures in the chambers, it enters into the ventricles.
D. Systole and diastole are two phases of the cardiac cycle. Systole occurs when the heart contracts, while diastole takes place when the heart relaxes after contraction. During diastole, when heart muscle is relaxed, the blood flows freely through the atria and owing to the low pressures in the chambers, it enters into the ventricles.

Explanations:

Systole and diastole are two phases of the cardiac cycle. Systole occurs when the heart contracts, while diastole takes place when the heart relaxes after contraction. During diastole, when heart muscle is relaxed, the blood flows freely through the atria and owing to the low pressures in the chambers, it enters into the ventricles.