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 heart has four valves â the aortic, mitral, tricuspid and pulmonary valves. Like valves used in house plumbing, the heart valves open to allow fluid (blood) to be pumped forward, and they close to prevent fluid from flowing backward. Human heart valves are flaps of tissue called leaflets or cusps. Heart valve problems fall into two major categories: Stenosis â The opening of the valve is too narrow, and this interferes with the forward flow of blood. Regurgitation â The valve doesn't close properly.