Why are anesthesiologists masters of physiology?

Clinical year med student here considering anesthesiology for a multitude of reasons. One of the things everyone says is that anesthesiologists are masters of physiology and understand it at a deeper level than most other physicians. I’m wondering why that’s the case? Lots of other specialties (internal medicine, ICU, etc) need to understand physiology for their job so what is it about anesthesiology that requires even deeper knowledge? Just curious as this is something I hear super commonly.
Source: Student Doctor Network - Category: Universities & Medical Training Authors: Tags: Anesthesiology Source Type: forums