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It is due to Diffusion Pressure Deficit, DPD for short.

When in the blood as oxyhemoglobin its DPD is almost twice that of cells, thus it passively diffuses into the cells from the blood.

A simpler way to look at is that products usually move from high density to low density areas via diffusion.

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12y ago
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12y ago

When attempting to answer this question to my students, I always refer back to this simple analogy: Think of the alveoli in the lungs like a bubbler in a fish tank. The alveoli release the oxygen into the blood much like the bubbler releases the oxygen into the water.

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10y ago

The blood in the capillaries comes in close contract with the thin membranes of the alveoli that simple diffusion allows oxygen to enter the body.

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9y ago

Diffusion means that something moves from a place of high concentration to a place of lower concentration. In this case oxygen is higher in the alveoli than in the capillaries.

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Q: Why does oxygen diffuse from aveoli to blood?
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Related questions

Which two gases are exchanged in the aveoli?

At the aveoli, the blood transfers CO2 and the hemoglobin on red blood cells picks up 02.


What causes oxygen from the water to diffuse into the blood?

the lungs causes oxygen from the water to diffuse into the blood


What gas diffuse from the tissues to the blood?

Both oxygen and carbon dioxide diffuse from body tissues into the blood.


Oxygen diffuse into the blood at the alveoli?

Carbon dioxide does.


What gas diffuses from the tissues to the blood?

Both oxygen and carbon dioxide diffuse from body tissues into the blood.


What is the process of gas exchange in the lungs including where it occurs?

Gases are exchanged in the aveoli where oxygen goes in the blood stream while carbon dioxide goes in the aveoli.


What absorbes oxygen from the air?

the aveoli in the Lungs


What is the exchange of gases between the blood and air?

Diffusion. In the lungs, oxygen will diffuse into de-oxygenated blood (oxygen was removed from the blood in the body) and carbon dioxide will diffuse out of the blood into the lungs and expelled from your body when you breathe out.


What is the primary function of the aveoli?

The alveoli are the site of carbon dioxide and oxygen exchange between the air and the blood.


In the lungs where does oxygen diffuse from?

There are two cells that oxygen must diffuse from. Once the oxygen enters the lungs, it is pushed to the aveoli, which is one cell thick and where the gas exchange occurs. Surrounding it are capillaries, which is also one cell thick. Here, oxygen moves across the two cells while the CO2 exits the red blood cell to exit the lungs.


What is the job of the bronchioles?

The brochiole's function is to allow oxygen to pass into the aveoli (air sacks covered in capillaries) where the oxygen can then enter your blood stream.


Does oxygen diffuse from large blood vessels into the bodies cells?

YES