Diastolic refers to:

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Multiple Choice

Diastolic refers to:

Explanation:
Diastole is the relaxation phase of the heartbeat, when the heart muscle relaxes and the ventricles fill with blood between beats. This relaxation allows the chambers to recharge for the next contraction. That’s why diastolic refers to the heart relaxing, and is also the basis for diastolic pressure, the arterial pressure measured during this filling phase. The alternative ideas don’t fit because contracting describes systole, the pumping phase; assuming blood flow slows isn’t the defining concept here, and valve closing relates to transitions between phases rather than what the term diastolic itself means.

Diastole is the relaxation phase of the heartbeat, when the heart muscle relaxes and the ventricles fill with blood between beats. This relaxation allows the chambers to recharge for the next contraction. That’s why diastolic refers to the heart relaxing, and is also the basis for diastolic pressure, the arterial pressure measured during this filling phase. The alternative ideas don’t fit because contracting describes systole, the pumping phase; assuming blood flow slows isn’t the defining concept here, and valve closing relates to transitions between phases rather than what the term diastolic itself means.

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