More than 60% of our body is filled with liquid. In fact, liquids facilitate many processes and reactions in our body. This includes the delivery of oxygen, communication of signalling molecules such as hormones and activation of immune cells through the blood vessels, exchange of gasses through lungs, and conversion of food into nutrients through the digestive system, without which we cannot survive. These complex processes and reactions can be defined by fundamental rules governing the balance of mass, momentum, energy and transport of species in liquid environments. This course will introduce you to such fundamental rules, to better understand your body, study various diseases, and eventually apply this knowledge to biomedical systems.