Animation of Oxygen Transport
YouTube is an excellent resource for teachers. As well as providing many useful and interesting videos (we feature many of them in our "YouTube Saturday" slot) there are some fantastic animations available, which can easily be incorporated in your lessons. Here is an excellent animation outlining the mechanism for the transportation of oxygen in the human body, from its collection in the alveoli of the lungs, its binding to haemoglobin in the red blood cells and subsequent absorption by tissues in the body. It is an excellent introduction to oxygen transport or osmosis.