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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If you could remove all of your skin, it would weigh up to 5 pounds.
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The human body produces and destroys 15 million blood cells every second.
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Serum cholesterol testing in adults is recommended every 1 to 5 years. People with diabetes and a family history of high cholesterol should be tested even more frequently.
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Amphetamine poisoning can cause intravascular coagulation, circulatory collapse, rhabdomyolysis, ischemic colitis, acute psychosis, hyperthermia, respiratory distress syndrome, and pericarditis.
Energy budget for a temperate deciduous forest (data from Gosz et al. 1978).