Heart Anatomy
Heart Facts
The heart is the hardest working muscle in the human body. Located almost in the center of the chest, the heart is a hollow muscular organ – approximately the size of your clenched fist.
At an average rate of 80 times a minute, the heart beats about 115,000 times in one day or 42 million times in a year. During an average lifetime, the human heart will beat more than 3 billion times – pumping an amount of blood that equals about 1 million barrels. Even at rest, the heart continuously works hard.
Overview of Heart Anatomy
The cardiovascular system, composed of the heart and blood vessels, is responsible for circulating blood throughout your body to supply the body with oxygen and nutrients.
The heart is the muscle that pumps blood filled with oxygen and nutrients through the blood vessels to the body tissues. It is made up of:
- Four chambers (two atria and two ventricles) that receive blood from the body and pump out blood to it.
- The atria receive blood coming back to the heart.
- The ventricles pump the blood out of the heart.
- Four valves to prevent backward flow of blood.
- Each valve has flaps, called leaflets, that allow the forward flow of blood and prevent the backward flow.
- A built-in electrical system that controls how fast it beats.
How does blood circulate through the body?
Blood vessels, which form a network of arteries and veins, carry blood throughout the body.
- Arteries transport blood from the heart to the body tissues.
- Veins carry blood back to the heart.
