Watch a watermelon wrapped in rubber bands explode in slow-motion. (CBS News) Have you ever wondered if you could cause a watermelon to explode by wrapping a ton of rubber bands around it? And have you additionally wondered what that explosion would end up looking like in super slow-motion? The answer to both questions is probably not, but it's very cool to watch happen anyways.
The valves keep blood moving through the heart in the right direction. The mitral valve and tricuspid valve are located between the between the atria (upper heart chambers) and the ventricles (lower heart chambers).
The two atria (right and left) hold the blood returning to the heart, and at just the right moment empty into the right and left ventricles. The four heart valves (tricuspid, pulmonary, mitral and aortic) keep the blood moving in the right direction through the heart.