Hemoglobin: The oxygen-carrying pigment and predominant protein in the red blood cells. Hemoglobin forms an unstable, reversible bond with oxygen. In its oxygenated state it is called oxyhemoglobin and is bright red.
Caffeine by McDonalds Iced Coffee Size. 1  Medium (16 floz): 133mg. 2  Large (22 floz): 200mg. 3  Extra Large (32 floz): 320mg.
Researchers from Labdoor looked at the caffeine content in a medium cup of brewed coffee from Starbucks, 7-Eleven, McDonald's and Dunkin' Donuts from stores in both New York and San Francisco. According to a Buzzfeed article, the researchers found that 7-Eleven had the highest average amount of caffeine per cup, at 280 milligrams of caffeine per cup.