The brand's famously low prices. Groceries at Aldi are shockingly cheaper than those at Wal-Mart, according to a study by Cheapism. They're also cheaper than those at industry darling Trader Joe's. Aldi employs a few smart strategies to sell groceries for so cheap. You won't find many brand names at Aldi.
Gas Exchange Between Alveolar Spaces and Capillaries. The function of the respiratory system is to exchange two gases: oxygen and carbon dioxide. The exchange takes place in the millions of alveoli in the lungs and the capillaries that envelop them. As shown below, inhaled oxygen moves from the alveoli to the blood in the capillaries, and carbon dioxide moves from the blood in the capillaries to the air in the alveoli.
While oxygen is taken into the body, carbon dioxide leaves the bloodstream in the alveoli of the lungs and is expelled into the atmosphere via the upper respiratory system. In one word gas exchange for humans occur in lungs. Our wind pipe which starts from nasal and oral cavity extends to lungs where it is divided into left and right know as bronchi. The bronchi gets further divided and re-divided many times in lungs. Each time it is divided there is a decrease in its size.