Blood is essential to life. We’re all born with it and will die with it. And unlike a hip or a heart or a lung, it can be replenished but never replaced. The volume of blood in our bodies ...

The right-hand side of the heart is responsible for pumping deoxygenated blood to the lungs. The left-hand side pumps oxygenated blood around the body. Each side of the heart consists of an atrium ...