They have no lungs, as gas exchange takes place through the trachea.

This must have allowed for better transpiration rates and gas exchange.

No gas exchange takes place in this part of the lungs.

The respiratory system, while immature, has developed to the point where gas exchange is possible.

It is also the surface of gas exchange; there are no respiratory organs.

Our findings did not reveal the magnitude of changes in gas exchange seen by others.

The respiratory zone is the site of gas exchange with blood.

This increases the surface area for gas exchange in the insect.

In animals, the lungs are the area where gas exchange takes place.

Without gas exchange, oxygen would not pass into the blood from the lungs.