Alveoli Game Information Page

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created by tickman, 7 years ago in Science

The alveoli are the sacs in the lung where oxygen and carbon dioxide are exchanged. Find the structure.

Image by author LadyofHats (Mariana Ruiz Villarreal) in the Wikimedia Commmons.

Tags Anatomy, science, biology, zoology, Respiratory, organs

This game has 10 questions


Comments (3)



Ballerina: that is normally correct, and it is the case in the rest of the body.

But in these are the pulmonary artery and vein. The artery is carrying deoxygenated blood from the heart. This is the blood that has returned from the rest of the body, and supplied it with oxygen. This blood is going into the lungs after having its oxygen removed, so it can be re-supplied.

The vein is taking oxygenated blood from the lungs to the heart, where it will be pumped to the rest of the body.

The colors indicate the state of oxygenation, not whether the vessel is a vein or an artery. This convention is confusing in two places: the pulmonary artery and vein, and the umbilical cord, where again, the vein carries oxygenated blood to the fetus, and the arteries carry deoxygenated blood to the placenta.

If you look at enough diagrams of these things, you'll find that the convention is not always followed.

4 years ago



um, hi tickman. i was just wondering why the vein is red on the diagram and the artery is blue. isn't it usually backwards? please correct me if i'm wrong. thanks :D

4 years ago



More about lungs (but not this image) here:

See the image on its homepage here:

The author has released this image into the public domain.

7 years ago