For a blood pressure reading of 136/78, the 78 refers to the pressure in the major arteries when the heart's ventricles are relaxing.

Name: For a blood pressure reading of 136/78, the 78 refers to the pressure in the major arteries when the heart's ventricles are relaxing.
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The second number in a blood pressure reading (78 in this case) refers to diastolic pressure, which is the pressure in the major arteries when the heart's ventricles are relaxed.

For a Blood Pressure Reading of 136/78, the 78 Refers