Your blood transports oxygen and nutrients around the body to your cells, at the same time removing metabolic waste from the cells. An average adult has just under 5 litres of blood circulating around their body.
A brief look at the composition of blood will show why our blood is important.
Blood is made up of:
Professor James Isbister discusses the important role your blood plays in your body.
Prof. James Isbister (Runs 1:22)
Why Your Blood is Important