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.
Four valves control the flow of blood from the atria to the ventricles and from the ventricles into the two large arteries connected to the heart. 1  The tricuspid (tri-CUSS-pid) valve is in the right side of the heart, between the right atrium and the right ventricle.
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.