Double circulation means our heart has separate pathways for oxygen-rich and oxygen-poor blood, which makes it more efficient. Blood pressure is the force this blood applies on artery walls. Actually, studying this reminds me of wiring a house – you need separate lines for power in and power out, otherwise everything gets mixed up and fails. Just last week, I saw my uncle's voltage stabilizer fry because live and neutral wires got crossed, much like how the heart keeps its circuits separate.
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