Ants don’t have lungs. They take in O2 and expel CO2 through pores in their bodies. This, as it happens, also enables them to live up to 14 days under water.
Some ants also have within them antibiotics. In some cultures it has been practiced that a rag would be thrown on an ant nest, allowing the ants to crawl all over it. The rag would then be shaken free of the little bastards and then wrapped around a wound, bringing about virtually immediate healing.