While the movie is a favorite for biology teachers to use as a "spot the errors" exercise, it does ground some concepts in reality: WordPress.com

Before Inside Out made us cry about our emotions, Osmosis Jones made us laugh at our white blood cells.

"Jones," a deep voice boomed. It was the Mayor, but he didn't look like a cartoon politician. He looked like a pulsing brain stem, connected to a thousand wires. "We have a breach in Sector 7. Stomach acid levels are rising. Someone ate the oyster."

The film splits its time between two drastically different worlds: