Blood circulation

Please, if you could, clarify your question and provide some detail as to what exactly you are wondering about.

Are you wondering about differences between amphibian circulation and that of vertebrates or mammals? Would you like general physiology? I guess what I am wondering is, what is it that you would like to know that you couldn't find the answer to within Wikipedia?

Also, if you could, at what level of study or education would you like this response to be?