The heart functions without us having to think about it and beats around 70 times every minute during our lifetime. That means that we have just over 100 000 heart beats every day, over 36 million heart beats every year and, if we live to be 80 years old, 2.94 billion heart beats during our life.
Each time the heart beats, it forces 0.07 litres of blood out of the left ventricle and into the body. This blood has just been to the lungs to pick up oxygen. The fresh blood is sent out through the main arteries, and then smaller arteries and capillaries, until it reaches every cell in the body, whether in the main organs, the top of the head, or the little toe. Using the calculations on how many heart beats we have, this means that the heart pumps 7000 litres of blood every day, 2.5 million litres of blood every year and 200 million litres in the lifetime of someone who lives to be 80.