Homeostasis refers to a system's ability
to regulate its INTERNAL environment.
The Big Bang Theory Season 6, Episode 2
At best you can say, "Hey, look, my idea
has an INTERNAL logical consistency."
The Big Bang Theory Season 1, Episode 3
No, he cut open a tauntaun and used
its INTERNAL body heat to warm him up.
The Big Bang Theory Season 2, Episode 23
According to the head of INTERNAL medicine
Money Heist Season 1, Episode 5
It’ll be the INTERNAL medicine doctor,
won’t it? I don’t know.
Money Heist Season 1, Episode 13