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.
McDonald's, for instance, had 9.1 mg per fluid ounce, while Starbucks packed more than double that at a full 20.6 milligrams. For more on those findings, click here. The average American consumes about 200 mg of caffeine a day. According to the FDA, 80 percent of U.S. adults consume caffeine each day, with an individual intake of 200 mg. To put that in real world terms, the average caffeine-consuming American drinks two five-ounce cups of coffee or about four sodas.