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Alveoli in the lungs.
Yes, Oxygen diffuses through the wall of the alveoli then through the walls of the capillaries. :)
as it moves through blood vessels capillaries in the alveoli walls, your blood takes oxygen from the alveoli and gives off carbon dioxide to the alveoli
alveoli
The answer is diffusion. The inhaled oxygen passes into the alveoli and then diffuses through the capillaries into the arterial blood. Meanwhile, the waste-rich blood from the veins releases its carbon dioxide into the alveoli. The carbon dioxide follows the same path out of the lungs when you exhale.
The alveoli and capillaries in the lungs pass oxygen to the blood. Both have very thin walls, which allow the oxygen to pass from the alveoli to the blood. The capillaries then connect to larger blood vessels, called veins, which bring the oxygenated blood from the lungs to the heart.
Inhaled oxygen diffuses through the walls of the alveoli in the lungs into the surrounding capillaries, where it binds to hemoglobin in red blood cells for transport to tissues in the body.
If their walls are too thick, substances like oxygen and nutrients and waste cannot pass across the cells into or out of the body.
Capillaries cover the alveoli in order to maximize the area for gas exchange between the lungs and the blood. Carbon dioxide is released from the blood through the capillary walls and into the alveoli, while oxygen is picked up from the alveoli through the capillary walls and into the blood.
diffusion
The lymphatic system, although the oxygen comes from the blood itself as it passes through the alveoli
During respiration the exchange of gases takes place through the walls of the alveoli. From there, the oxygen is taken by the blood to the body tissues.