where i got my images from :
https://www.google.com.au/search?q=2D+diagram+of+red+blood+cell&espv=2&biw=1366&bih=623&source=lnms&tbm=isch&sa=X&ved=0CAYQ_AUoAWoVChMIo_Si89C5xwIVBa6mCh3M2gux&dpr=1#imgrc=quti__Qsgp-_pM%3A
https://www.google.com.au/search?q=sources&source=lnms&tbm=isch&sa=X&ved=0CAcQ_AUoAWoVChMIib3u1dW5xwIV4-WmCh11GQsv&biw=1366&bih=623#imgrc=DAxNDpJ1bOC-lM%3A
https://www.google.com.au/search?q=question+mark&source=lnms&tbm=isch&sa=X&ved=0CAcQ_AUoAWoVChMI0NTAltS5xwIVoymmCh0OTQVD&biw=1366&bih=623#imgrc=X9vjqdWZCU1hpM%3A
https://www.google.com.au/search?q=2D+diagram+of+red+blood+cell&espv=2&biw=1366&bih=623&source=lnms&tbm=isch&sa=X&ved=0CAYQ_AUoAWoVChMIo_Si89C5xwIVBa6mCh3M2gux&dpr=1#tbm=isch&q=single+red+blood+cell&imgrc=wIWKFyyHlCjzPM%3A
where i got my information from :
https://www.google.com.au/webhp?sourceid=chrome-instant&ion=1&espv=2&ie=UTF-8#q=function%20of%20red%20blood%20cells
http://www.biosbcc.net/doohan/sample/htm/Blood%20cells.htm
i learnt some of the information included here during class aswel.