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Diffusion causes gas exchange as it moves the oxygen to where its needed and the carbon dioxide moved out.

Diffusion occurs when molecules move from an area of high concentration (of molecule) to an area of low concentration. This occurs during gaseous exchange as the blood in the capillaries surrounding the alveoli has a lower oxygen concentration of Oxygen than the air in the alveoli which has just been inhaled. Both alveoli and capillaries have walls which are only one cell thick and allow gases to diffuse across them. The same happens with Carbon Dioxide (CO2). The blood in the surrounding capillaries has a higher concentration of CO2 than the inspired air due to it being a waste product of energy production. Therefore CO2 diffuses the other way, from the capillaries, into the alveoli where it can then be exhaled.

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13y ago
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13y ago

Carbon dioxide is excreted and oxygen is absorbed in the lungs.

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Q: Where gas exchange happens?
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Related questions

Where gas exchange happens in the lungs?

Gas exchange happens in the capillaries. Oxygen is replaced with Carbon Dioxide which is transported from the heart.


What happens at the respiratory membrane?

gas exchange


What happens at the tissue level for gas exchange?

it will be exhaling.


What happens as blood passes each cell?

Gas exchange.


What happens in the alveoli in the process of gas exchange.?

Alveoli- these are the small sac-like structures where gas exchange occurs with the blood. Its creates an ideal site for gas exchange between the air in the lungs and the blood in the capillaries.


What happens if the surface area of the respiratory membrane decrease in gas exchange?

A decrease in the surface area of the respiratory membrane will result in a decrease in gas exchange.


Which is the main gas humans exhale?

Carbon dioxide (CO2). It is exchanged with Oxygen (O), which is inhaled. This exchange is called the Gas Exchange and it happens in the Aveolus.


Why do we called lungs as the main organ in respiratory system?

Because that is where the primary gas exchange happens.


What happens in the air sacs of the lungs?

The gas exchange between carbon dioxide and oxygen occurs.


What happens to gas exchange during normal respiration?

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What happens to each layer of your respiratory system as you breathe?

To give you a very basic answer: gas exchange


Which blood vessels in the lungs help your body take in and give out gases?

Gas exchange happens in the bed of CAPILLARIES in the lungs.