The heart is one of the most important organs in our body. A little knowledge of how your heart works can lead to an appreciation of what is good
and bad for it. This pear-shaped organ beats about 80,000 to 100,000 times a day, pumping almost 2,000 gallons of blood
The heart is about the size of a clenched fist and is located to the left of the middle of your chest. Working like a pump, it provides the body with
oxygen-rich blood and nutrients and carries away de-oxygenated blood. The heart can be considered as two pumps in one. The right side of the heart receives de-oxygenated blood from the body and pumps it to the lungs. The left side of the heart does the exact opposite. It receives oxygen-rich blood from the lungs and pumps it out to the body. The body cells use the oxygen in th blood.
Structure of Heart
The heart is made up of four different blood-filled chambers. (The hearts of different animals may have different chambers.). Each side of the heart has two chambers. One chamber is on the top and one chamber is on the bottom. The two chambers on top are called the atria; a single chamber is called an atrium. The atria are the chambers where blood is collected from the body and lungs. The heart has a left atrium and a right atrium. The two chambers on the bottom are called the left and right ventricles. They pump blood to the body and lungs.