Learn Hardcore Romanian: Respirația bărbatului rămâne stabilă până ajunge ambulanța. - The man's breathing remains stable until the ambulance arrives.

Respirația means breathing or respiration. In this sentence, it refers to the man’s breathing as a general bodily function, not to a single breath.

Romanian often uses respirație where English would naturally say breathing.

Why does respirația end in -a?

The -a is the Romanian definite article attached to the end of the noun. So:

respirație = breathing / respiration
respirația = the breathing / the respiration

Romanian usually puts the at the end of the noun instead of using a separate word like English does.

Why is it bărbatului and not bărbatul?

Because this is a genitive form, meaning of the man.

Compare:

bărbatul = the man
bărbatului = of the man / the man’s

So respirația bărbatului literally means the breathing of the man, which is how Romanian expresses the man’s breathing.