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).
Updated August 29, 2016. There are four heart valves in a healthy human heart. The valves help to maintain proper blood flow through the heart, keeping blood moving efficiently and smoothly, and in the right direction. In addition to the valves there are four heart chambers -- the upper chambers are called the left and right atrium, the lower chambers are the left and right ventricle. A healthy heart valve will stop blood from flowing out of a heart chamber until it is time for the heart to pump the blood to its next destination.