For the skin to serve as a respiratory organ, it must remain moist.

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

There are no respiratory organs, heart or blood vessels.

The introduction of the lightest part into the respiratory organs caused death.

Both the lungs and the skin serve as respiratory organs in amphibians.

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

As is typical for such small animals, there are no respiratory or circulatory organs.

However, many species have no respiratory organs at all and breathe directly through the cuticle.

There is no evidence of a respiratory organ, though the bursa may serve this purpose.

It causes immediate injury upon contact with the eyes or respiratory organs.