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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Asthma cases in Americans are about 75% higher today than they were in 1980.
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Sperm cells are so tiny that 400 to 500 million (400,000,000–500,000,000) of them fit onto 1 tsp.
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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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It is believed that the Incas used anesthesia. Evidence supports the theory that shamans chewed cocoa leaves and drilled holes into the heads of patients (letting evil spirits escape), spitting into the wounds they made. The mixture of cocaine, saliva, and resin numbed the site enough to allow hours of drilling.
The path of blood flow through the chambers of the left and right side of the heart, including the v
Sinus tachycardia.
Aneurysm. Photograph of the aorta, the large blood vessel arising from the heart, with a large bulge
Heart Model
Influence of substrate concentration on the rate of an enzyme-catalyzed reaction.
How an Increase in Income Inequality Affects the Desired Tax Rate