With my current year 5, just finishing term 2, we have been using Blood and Guts along with Human Body Theater by Maris Wicks. There is some overlap, but each has a good deal that the other either lacks or explains in different ways. It has gone really well so far.
Shannon
Y6 & Y4 & a dog & 4 fine hens & various caterpillars
Y6 & Y4 & a dog & 4 fine hens & various caterpillars