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.
By comparison, Starbucks has 20.6 milligrams of coffee per fluid ounce, followed by Caribou Coffee (15 milligrams), Dunkin' Donuts (12.7 milligrams), Seattle's Best (10.4 milligrams) and McDonald's (9.1 milligrams). Higher caffeine levels generally correlate to higher prices.