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When blood is exposed to air, it clots. Heparin allows the blood to come in direct contact with air without clotting.

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Vital signs (blood pressure, temperature, pulse rate, respiration rate) should be taken before any drug administration. Patients should be informed not to use tobacco or caffeine at least 30 minutes before their appointment.

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Blood in the urine can be a sign of a kidney stone, glomerulonephritis, or other kidney problems.

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When blood is deoxygenated and flowing back to the heart through the veins, it is dark reddish-blue in color. Blood in the arteries that is oxygenated and flowing out to the body is bright red. Whereas arterial blood comes out in spurts, venous blood flows.

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Your heart beats over 36 million times a year.

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