What Is Blood?

In this video we are going to discover what blood is made of and the roles of the different components. Blood consists of red blood cells, white blood cells, platelets and plasma. Red blood cells are disc shaped and contain haemoglobin, which is the iron containing protein which transports oxygen in the blood. White blood cells are the warriors, attacking and killing invading pathogens. Phagocytes and lymphocytes are two types of white blood cells. Platelets help to make our blood clot when we fall over and cut ourself. Plasma is a yellow sticky liquid that makes up the majority of our blood. It carries nutrients, hormones and proteins around the body, and is largely made up of water.