Our heart rate varies depending on the bodies demand for oxygen it may speed up as demand increases and slow down as demand decreases; an unusually high rate when resting or a low maximum heart rate may indicate a heart attack risk pending.
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It’s less than 100 years since we have been able to confirm the various types of blood groups; you may think this is something we don’t need to pay much attention to. — Read Article
High blood pressure or hypertension may cause aneurisms in blood vessels; rather like a tyre blowout on a bicycle where the tube bulges through weak tyres and then bursts. In the case of our cardiovascular system resulting in internal bleeding, strokes and heart attacks, vision and kidney disease are also linked to high blood pressure. — Read Article