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Certain chemicals, after ingestion, can be converted by the body into cyanide. Most of these chemicals have been removed from the market, but some old nail polish remover, solvents, and plastics manufacturing solutions can contain these substances.
Many of the drugs used by neuroscientists are derived from toxic plants and venomous animals (such as snakes, spiders, snails, and puffer fish).
When blood is exposed to air, it clots. Heparin allows the blood to come in direct contact with air without clotting.
Malaria mortality rates are falling. Increased malaria prevention and control measures have greatly improved these rates. Since 2000, malaria mortality rates have fallen globally by 60% among all age groups, and by 65% among children under age 5.
The familiar sounds of your heart are made by the heart's valves as they open and close.
![The urinary system: kidneys, ureters, bladder, and urethra with expanded view of a nephron and the u](https://biology-forums.com/gallery/47/medium_14755_05_10_12_4_15_35_92751702.jpeg)
![Leukemia. A blood smear from a patient suffering from leukemia demonstrates the abundance of enlarge](https://biology-forums.com/gallery/47/medium_14755_11_11_12_7_18_46_100411265.jpeg)