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Oxygen enters the blood stream through the air sacs in you lungs.
In air breathing animals, oxygen enters the blood stream through the alveoli, tiny sacs in the lungs. In water breathing animals oxygen enters the blood stream through the gills.
Blood contains more oxygen than air sacs. Oxygen from inhaled air diffuses across the walls of the air sacs into the bloodstream, where it binds to hemoglobin in red blood cells for transport to tissues throughout the body.
Oxygen must enter our blood and Carbon Dioxide must leave the blood through our lungs. They do so by diffusion between the cappillaries.
Because the air sacs carry oxygen to the blood!
They are the alveoli.
The oxygen molecules enter the bloodstream by diffusing through the thin walls of the capillaries that surround the air sacs in the lungs. These capillaries are where the exchange of gases like oxygen and carbon dioxide occurs. The oxygen molecules bind to hemoglobin in red blood cells, and are then transported throughout the body to cells and tissues that need oxygen for energy production.
Oxygen enters the pulmonary blood in the capillaries of the alveoli -- the air sacs of the lungs.
In the air sacs oxygen and other gases are stored and separated to be put into the blood stream.
Oxygen diffuses into the blood from the air sacs in the lungs during the process of respiration.
the air goes into your lungs. In your lungs there are billions of tiny air sacs. Surrounding each air sac is a network of blood capillaries. The air sacs and the blood capillaries are separated by a thin membrane. Across this membrane the air sacs give the blood capillaries oxygen and they blood capillaries give the air sacs carbon dioxide. We breathe out this carbon dioxide!
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