When blood is exposed to air, it clots. Heparin allows the blood to come in direct contact with air without clotting.
Did you know?
There are more bacteria in your mouth than there are people in the world.
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The ratio of hydrogen atoms to oxygen in water (H2O) is 2:1.
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The Babylonians wrote numbers in a system that used 60 as the base value rather than the number 10. They did not have a symbol for "zero."
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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.
Diagram of the general anatomy of a male cat
General Biology
The Two-Step Persuasion Technique to Encourage Community Service
Overview of lymphatic system structures and the general direction of lymph flow from the extremities ...