ALVEOLI are the very small air sacs where the exchange of oxygen and carbon dioxide takes place. CAPILLARIES are blood vessels in the walls of the alveoli. Blood passes through the capillaries, entering through your PULMONARY ARTERY and leaving via your PULMONARY VEIN.
Schedule I includes heroin, lysergic acid diethylamide, cannabis, and a few other drugs fall into this schedule. All of these not currently being accepted into the US.
