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 approximately 3 million unintended pregnancies in the United States each year.
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Excessive alcohol use costs the country approximately $235 billion every year.
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In the United States, an estimated 50 million unnecessary antibiotics are prescribed for viral respiratory infections.
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Eating carrots will improve your eyesight. Carrots are high in vitamin A (retinol), which is essential for good vision. It can also be found in milk, cheese, egg yolks, and liver.
How the immune system fights a viral infection
The 20 common amino acids used to build proteins
Endocrine system mind map
Earth’s Climate System
Intramuscular Injection
Autonomic innervation of the female reproductive system