Mucous glands keep the skin moist allowing gases to enter and exit the skin.
Blood cells receive the oxygen and release carbon dioxide. During the day they rest in moist areas, under logs, debris or rocks. At night, they hunt for mites, beetles, flies and other insects. They breathe through their skin and linings of their mouth and throat, all of which are well supplied with numerous blood vessels that absorb and release gases. Lungless salamanders are always in a wet environment because their skin must always be moist for them to breathe.