Double circulation means our heart has two separate loops—pulmonary to the lungs and systemic to the body—ensuring oxygen-rich and oxygen-poor blood don’t mix. Blood pressure is that push against artery walls, systolic during heartbeats and diastolic during rest. All this I can recite in my sleep, but when I see Appa’s tired face after his BP medication, the numbers on the monitor matter less than the quiet worry in his eyes.
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