Gas exchange takes place through the wall of the pouch.

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

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

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

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

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

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

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

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

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

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

There are no respiratory organs, with gas exchange able to occur across the whole of the body.

This is an internal series of lamellae used for gas exchange with the air.

The impaired gas exchange can contribute to the fatigue associated with bed rest.

Nicole bent down to examine the individual gas exchange devices.

The strategy for a safe rate of ascent at this stage is to balance gas exchange.

It leads to impaired gas exchange and may cause respiratory failure.

The tentacles are also used as gills for gas exchange.

They supplement this with gas exchange through the skin.

Lungs contain a large surface area to facilitate this gas exchange process.

However this process can go for a long period of time, because of the advanced gas exchange system.

At the same time, the tentacles act as gills for gas exchange.

They have large air spaces and therefore provide a large surface area for gas exchange.

It is these lamellae that are the actual sites of gas exchange.

These are short vertical roots and are used for gas exchange.