Final answer:
The correct term for the pressure in an artery when the heart's ventricles are refilling is diastolic pressure, which is the lower number in a blood pressure reading.
Step-by-step explanation:
The measurement of the pressure in an artery when the ventricles of the heart are refilling from the left atrium is known as diastolic pressure. This is the lower number in blood pressure readings, and it represents the pressure in the arteries during the relaxation phase of the cardiac cycle, or diastole. On the other hand, systolic pressure is the higher number that reflects the arterial pressure as a result of the ejection of blood during the contraction of the heart's ventricles, or systole. Pulse pressure is the difference between the systolic and diastolic pressures, and mean arterial pressure (MAP) is an average pressure in the arteries, roughly estimated by adding the diastolic pressure to one-third of the pulse pressure.