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Did you know?
The familiar sounds of your heart are made by the heart's valves as they open and close.
Did you know?
During pregnancy, a woman is more likely to experience bleeding gums and nosebleeds caused by hormonal changes that increase blood flow to the mouth and nose.
Did you know?
The heart is located in the center of the chest, with part of it tipped slightly so that it taps against the left side of the chest.
Did you know?
The horizontal fraction bar was introduced by the Arabs.
Did you know?
About 100 new prescription or over-the-counter drugs come into the U.S. market every year.