How does the heart work?
The heart provides the body’s organs and tissues with a constant supply of blood – and with it vital oxygen and nutrients. You can think of the heart as a central pump that keeps the blood circulating around the body.
At rest, an adult heart beats about 60 to 80 times a minute. Each time the heart beats it pumps blood through the body. When we exert ourselves physically, our heart beats faster. This increases the speed at which blood flows through our body. The blood can then absorb more oxygen from the lungs per minute in order to supply the body's cells with more oxygen.