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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 human body's pharmacokinetics are quite varied. Our hair holds onto drugs longer than our urine, blood, or saliva. For example, alcohol can be detected in the hair for up to 90 days after it was consumed. The same is true for marijuana, cocaine, ecstasy, heroin, methamphetamine, and nicotine.

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There are more nerve cells in one human brain than there are stars in the Milky Way.

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Though Candida and Aspergillus species are the most common fungal pathogens causing invasive fungal disease in the immunocompromised, infections due to previously uncommon hyaline and dematiaceous filamentous fungi are occurring more often today. Rare fungal infections, once accurately diagnosed, may require surgical debridement, immunotherapy, and newer antifungals used singly or in combination with older antifungals, on a case-by-case basis.

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Nearly 31 million adults in America have a total cholesterol level that is more than 240 mg per dL.

The sexual cycle of flowering plants involves alternation of sporophyte and gametophyte generations. The sexual cycle of flowering plants involves alternation of sporophyte and gametophyte generations.
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Video: Antidiuretic hormone (vasoconstriction, water reabsorption & sweat inhibition)

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