Diastolic blood flow refers to the phase when the heart relaxes and blood flows back into the heart.

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Prepare for the MTTC Integrated Science (Secondary) Test. Utilize flashcards and multiple-choice questions, each accompanied by hints and explanations. Achieve success in your exam journey!

Multiple Choice

Diastolic blood flow refers to the phase when the heart relaxes and blood flows back into the heart.

Explanation:
During diastole the heart relaxes and the chambers fill with blood. As the heart muscles loosen, pressure inside the chambers falls and the atrioventricular valves are open, allowing blood returning from the body and lungs to flow into the heart. This phase is all about filling the ventricles in preparation for the next heartbeat, so describing diastolic flow as blood flowing back into the heart fits the idea of the heart receiving blood during relaxation. The other options point to what happens when the heart contracts and pushes blood out, not when it is relaxing and filling.

During diastole the heart relaxes and the chambers fill with blood. As the heart muscles loosen, pressure inside the chambers falls and the atrioventricular valves are open, allowing blood returning from the body and lungs to flow into the heart. This phase is all about filling the ventricles in preparation for the next heartbeat, so describing diastolic flow as blood flowing back into the heart fits the idea of the heart receiving blood during relaxation. The other options point to what happens when the heart contracts and pushes blood out, not when it is relaxing and filling.

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