Emergency General Surgery is not a service at any of my 3 hospitals. We go by the older and antiquated method still
At the University Hospital, General surgery call is rotated between two teams, the General Surgery team (~3 of the 4 weeks) and the Surgical Oncology team (the remaining week of the month). During the day, the residents on that team take the calls from the ER. Those teams generally have a chief, midlevel, and 1-2 interns. No NP/PA's. It's surgeon of the block of days (usually 4-7 straight days for that surgeon). They are on 24/7. Scope of practice is anything that falls under general surgery. Trauma is it's own service, Vascular/Thoracic all go to their own service. Night is covered by an inhouse midlevel night float, and an inhouse intern night float. Midlevel will see the consults and call the chief resident for the team for all new consults. Depending on the attending and situation, the chief resident will tell the midlevel what to do, may have to come in, and may or may not call the attending (usually only if needing to operate that evening, otherwise it waits til the morning).
At our Private Hospital, again, Gen Surgery is rotated between two teams of residents, which covers a few practice groups (A group of 4 with 2 vascular surgeons and 2 general surgeons, the vascular guys taking some general call too, the group of 6 or so trauma surgeons, the bariatric/minimally invasive group of like 5 attendings, and then a few individual practioners). Each attending is on for 24hours and unless someone specifically requests a consultant, it goes to the board. Those teams are similarly a chief (4 or 5), mid-level or two, and two interns. Night float is inhouse 4, 2/3, and intern. Midlevel sees consults, informs inhouse 4 if it is complex, they need assistance, or if it will go to the OR, otherwise calls attending directly after seeing the consult. If its the inhouse trauma attending, they will usually come see the patient then and there, otherwise it usually waits to the morning unless they need to come in an operate. During the day there are NP's on the teams that will assist seeing the consults, but this is a beast of an ER and overnight its common to get 10-15 consults. Scope is similar, general surgery stuff.
The VA is the VA. There is one team at the VA, which has a 5, 4, 2 midlevels, and a gaggle of interns. Call is Q3 between the midlevels and the 4 (painful for the 4 to take "midlevel" call, but that's how the cookie crumbles for this year at least... its the first time it's happened this way, and may change next year). Everything goes thru the chief first (the PGY4 acts as both the mid-level and chief when they are on, not having to call the PGY5 overnight) and then through the attending. And rarely are there ever operations overnight at the VA (or consults for that matter). Scope is everything surgical that walks in the door. Maybe not Ortho, but everything else.