Want this question answered?
Oxygen and other gases pass through the capillaries.
Capillaries
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.
Capillaries
Capillaries
Capillaries
Oxygen and carbon dioxide easily pass back and forth between the alveoli and the blood through the capillaries.
Oxygen is lipid soluble therefore it can pass directly through the cell membranes of the capillaries.
Oxygen is transported by red blood cells and is released into tissues as they pass through capillaries in the tissue.
Capillaries are very thin blood vessels. Oxygen and nutrients and hormones can pass through the walls of the capillaries and reach the body's cells, while red blood cells remain in the capillaries.
capillaries
No, all gas exchange is done through capillaries. Both veins and arteries are too thick and contain muscle layers that prevent gas exchange. However, capillaries are small enough (blood cells can only pass through one at a time) that oxygen can pass to the tissues and carbon dioxide can pass to the RBCs.