<prompt> Of the total oxygen consumed by the body per min., greatest fraction is consumed by:LiverBrainMusclekidney  <response>: Under resting conditions, total O2 consumption by the body 250 mlmin. Greatest fraction of this O2 consumption is by the liver Liver - 30 or 75 mlmin. Muscle consumes 20 or 50 mlmin. Brain consumes 18 or 45 mlmin. In terms of per 100 gm of tissue per min., highest O2 consumption is by the hea - 8 ml100 gmmin. 