At a lower temperature, the cells will carry out metabolic processes at a lower rate. They will therefore require less oxygen. And so hemoglobin will be less likely to actually unload that oxygen. And that's exactly why the red curve describes a greater percentage of saturation of hemoglobin about 80% compared to the 70% for our normal temperature. So, once again, a decrease in temperature has the opposite effect. As in this particular case, it causes the hemoglobin to bind to oxygen more strongly, and this decreases the likelihood that it will unload the o two into those tissues.