I know that the phosphate [cells] and sodium barcarbonate [blood plasma] buffer systems are two examples of biological buffers; however, i am writing an essay for bio and i need a third example. does anyone know of a third biological buffer system?

Answer 1

http://www.brynmawr.edu/Acads/Chem/Chem104lc/buffers.html

See the three classes here.

Answer 2

try this site
scifun.chem.wisc.edu/chemweek/BioBuff/BioBuffers.html

Answer 3

thanks