Ronda Rousey interrupts the scene of the movie "911", fights against pain!

Ronda Rousey is so difficult, she broke her finger on the set of the "9-1-1"TV show – BUT NEVER CHARACTER!"

Ronda – who plays the role of badass in the L.A. Fire series – shot a scene in Mexico last week in which she was supposed to slam a door during a moment of dramatic action.

But, as one source said … "She was a little too exuberant and slammed the door on her finger."

We are told that Ronda did not grin, did not complain, did not spoil the scene … instead, she continued to stay in the character and finished the scene.

Only after the director shouted "cut", we were told, Ronda finally recognized the injury – saying, "Ow, you're not going that way!"

Ronda consulted a doctor who diagnosed him with a broken finger – which is NOTHING for the former UFC superstar.

She had a splint for the hand and went back to work the next day, tell us our sources.

Hollywood … it's not for the weak.