This is a diagram I created to summarise the immune response, complete with friendly, loveable cartoon immune cells designed in an attempt to make what can be a very complicated and confusing subject seem a little less threatening. The students I taught the subject to loved the "cute" summary format and found immunology to be a much more approachable revision topic as a result!
Since this image has been so popular with all you lovely people, I have also written a comprehensive article on the immune response - complete with lots of illustrations - which is available here on Geeky Medics: http://geekymedics.com/2014/07/02/immune-response/
Enjoy and good luck!
Physiology lecture introducing the six major functions of the kidneys, including: excretion, regulation of volume status, regulation of electrolytes and acid/base balance, secretion of erythropoetin and renin, and gluconeogenesis.