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Put "digestion powerpoint presentation" into Google search. Then do the same with respiration and circulation. You will find some sites that may be of help. ie...this one.
http://74.125.47.132/search?q=cache:zy0jtCFcCNcJ:www.spolem.co.uk/worksheets/docs/Digestion.ppt+digestion+powerpoint+presentation&cd=3&hl=en&ct=clnk&gl=us&ie=UTF-8