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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.
There are approximately 3 million unintended pregnancies in the United States each year.
The most common treatment options for addiction include psychotherapy, support groups, and individual counseling.
The lipid bilayer is made of phospholipids. They are arranged in a double layer because one of their ends is attracted to water while the other is repelled by water.
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.