In the respiratory tract, gas exchange takes place in the alveoli of both of the lungs. The alveoli are small sacs of air that are covered in a material known as surfactant. This substance allows the alveoli to expand an... More »

Gas exchange occurs in the alveoli of the lungs, as well as in the capillaries that surround the alveoli, explains Teach PE. The exchange of gases in these two regions occurs through the process of diffusion, whereby oxy... More »

Earthworms actually breathe through their skin, which means that their mechanism for gas exchange involves their entire body. This means that oxygen comes in through the skin and that carbon dioxide ultimately exits the ... More »

Gaseous exchange takes place in the lungs' alveoli, which are tiny sacs found at the ends of the terminal bronchioles. The gases that are exchanged are oxygen and carbon dioxide. More »

Gas exchange occurs in the alveoli of the lungs. In these alveoli, carbon dioxide moves from the red blood cells into the alveoli, and oxygen moves from the alveoli into the red blood cells. More »

The actual sites of gas exchange within the lungs are within tiny air sacs called alveoli. They are found at the end of the bronchial tubes. More »

Pulmonary alveoli are the tiny sacs inside the lungs that fill with air with each breath and facilitate the exchange of gas with the blood. According to HowStuffWorks, the oxygen concentration in the alveoli is high, rel... More »