The healthy heart weighs well under a pound and is only a little larger than your fist. It is a powerful, continuously hard-working organ. In addition to maintaining a steady, normal flow of blood it must be able to adjust and adapt quickly to the body’s ever changing needs. For example, it must pump more blood with strenuous activity and less blood when you are at rest. In an average day, the heart will contract an average of 60 to 90 times per minute — 42 million heartbeats per year!
Your heart is actually a two-sided pump responsible for circulating blood throughout your body. Inside your heart there are four chambers. A wall of muscle called the septum divides your heart into a left side and a right side.