Arnold's Esophagus is the second part of Arnold's digestive system where Ms. Frizzle and her class travel down on their field trip of there in The Magic School Bus episode, For Lunch. They travel down it again in Goes Cellular.
History[]
After being swallowed, the bus is seen getting pushed to Arnold's stomach by his esophagus via peristalsis. Ms. Frizzle lets go of the wheel, joking that she is letting his digestive system do the driving. Keesha compares the experience to getting pushed out of toothpaste, while Wanda compares it to driving down a tunnel. Carlos asks Arnold for "a push" as a joke.
Ms. Frizzle asks if anyone knows where the esophagus leads. Ralphie responds by stating he doesn't know how much more he can stomach. Ms. Frizzle tells him that he's right as the class suddenly drops into Arnold's stomach.