Authors: Sophie Chargé, PhD, and Kendra Hodgkinson, PhD
Online publication date: January 2017
What is blood?
With every heartbeat, about five litres of blood are pumped through your body.
Blood flows through thousands of kilometres of blood vessels, delivering oxygen and nutrients to the organs and carrying waste products away. Blood also transports cells, hormones and proteins that regulate many body functions, such as fighting infection and controlling blood loss.