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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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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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People with high total cholesterol have about two times the risk for heart disease as people with ideal levels.
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It is difficult to obtain enough calcium without consuming milk or other dairy foods.
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Fungal nail infections account for up to 30% of all skin infections. They affect 5% of the general population—mostly people over the age of 70.