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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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The average human gut is home to perhaps 500 to 1,000 different species of bacteria.
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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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Human neurons are so small that they require a microscope in order to be seen. However, some neurons can be up to 3 feet long, such as those that extend from the spinal cord to the toes.
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People about to have surgery must tell their health care providers about all supplements they take.