Alveoli
the alveoli
The small sacs are alveoli which is where oxygen and carbon dioxide are exchanged
Frizzophigus
Arterioles are very small arteries which lead from arteries in to a capillary bed where gases, wastes and nutrients are exchanged.
Oxygen and carbon dioxide. (O2) and (CO2)
The alveoli are small sacs within the lungs where gas exchange occurs. They are located at the ends of bronchiole branches.
You don't specify which organism you are asking about, but I assume you mean in humans. These processes happen all over the body between the blood capillaries and the cells. If you mean exchange with the outside world, then oxygen is exchanged in the lungs, food nutrients in the small intestine, and nitrogenous waste in the kidneys. However, waste carbon dioxide is exchanged through the lungs and other wastes through the skin.
The humorus
When air is inhaled it is brought into aveoli, which are very small sacs surrounded by capilaries. These capilaries have blood flowing through them, and oxygen diffuses into the blood and carbon dioxide diffuses out of the blood and into the lungs.
When polar bears breathe, their lungs fill with a mixture of gases including oxygen. The polar bear's body separates out most of the gases which are not oxygen and expels them. The oxygen is then transported into the bloodstream by small vessels in the lungs.
Mammals breathe using organs called lungs. They take air in and the oxygen is exchanged for carbon dioxide in small organelles called alveoli. This carbon dioxide is then expelled.
The exchange of carbon dioxide and oxygen occurs in the alveoli. Each alveolus is surrounded by a network of small blood vessels. Like the alveoli, these small blood vessels have extremely thin walls. Blood that enters the vessels has a high level of carbon dioxide, which it picked up from the body tissues. It contains little oxygen. The carbon dioxide leaves the blood and moves through the walls of the blood vessels and alveoli into the lungs. Oxygen from the air in the lungs then passes through the walls of the alveoli and blood vessels and into the blood. The blood, now rich in oxygen, leaves the lungs and travels to the heart. The heart then pumps it to cells throughout the body. The carbon dioxide is finally expelled from the lungs when we exhale.By ichigo kurosaki
effusion