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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.
For about 100 years, scientists thought that peptic ulcers were caused by stress, spicy food, and alcohol. Later, researchers added stomach acid to the list of causes and began treating ulcers with antacids. Now it is known that peptic ulcers are predominantly caused by Helicobacter pylori, a spiral-shaped bacterium that normally exist in the stomach.
Patients who cannot swallow may receive nutrition via a parenteral route—usually, a catheter is inserted through the chest into a large vein going into the heart.
Human kidneys will clean about 1 million gallons of blood in an average lifetime.
Urine turns bright yellow if larger than normal amounts of certain substances are consumed; one of these substances is asparagus.