+++Osmosis
The small sac-like structures in the lungs are called alveoli. This is where the exchange of oxygen and carbon dioxide occurs with the bloodstream, a process known as gas exchange. Oxygen diffuses from the alveoli into the bloodstream, while carbon dioxide moves from the bloodstream into the alveoli to be exhaled.
Oxygen moves into the lungs where it is absorbed into the bloodstream through tiny air sacs called alveoli.
+++Osmosis
Oxygen moves from the lungs into the bloodstream through a process called diffusion. This occurs at the alveoli, which are small air sacs in the lungs where oxygen and carbon dioxide are exchanged with the blood. Oxygen diffuses from an area of high concentration in the alveoli to an area of lower concentration in the blood, facilitated by the difference in partial pressures.
This process is called gas exchange. In the lungs, oxygen enters the bloodstream through diffusion across the alveolar membrane, where it binds to hemoglobin in red blood cells for transportation to tissues.
Oxygen is the substance that moves from the bloodstream to the air via the lungs during respiration. This process occurs in the alveoli of the lungs where oxygen is exchanged for carbon dioxide.
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Oxygen moves through the body via the bloodstream, carried by red blood cells. It is inhaled into the lungs, where it diffuses from the alveoli into the bloodstream, and then transported to tissues and organs where it is exchanged for carbon dioxide to be exhaled.
Oxygen and carbon dioxide are the two important gases that diffuse across the respiratory membrane. Oxygen moves from the alveoli into the bloodstream, while carbon dioxide moves from the bloodstream into the alveoli to be exhaled.
Oxygen diffuses from the alveoli in the lungs into the surrounding capillaries. The concentration of oxygen in the alveoli is higher than in the blood, so oxygen moves across the thin wall of the alveoli and into the bloodstream through a process called diffusion.
Oxygen is moving by simple diffusion. It is going from a higher level of oxygen (air) to lower (blood).
The respiratory system brings oxygen into the body and the circulatory system, specifically the cardiovascular system, moves the oxygen around the body via the bloodstream.