Lindsay Lohan's Morgue Duty -- Blood and Guts

Lindsay Lohan will see blood and guts when she performs her service at the L.A. County Morgue ... a source in the Coroner's Office tells TMZ.

We're told Lindsay will be cleaning tables where the autopsies are performed, and various body parts and fluids often remain for disposal after the body is removed.

Lindsay will also be sweeping floors, cleaning toilets, washing windows and picking up trash.

We're told she will not be handling any of the bodies.