This actually depends on which level of education you are and what they are looking for. Most people though merely considers it a part of the Digestive System as the bile it stores is used during digestion.
I have seen however several people put it down as part of the bilary system or subsystem which responsible for the creation and distribution of bile.
Answer:
50mg or 100mg this is the answer not sure
True, It Helps Protect The Workers From Getting Germs Onto Them And Then Onto The Patient (Which Is Why Healthcare Workers Wear New Equipment, Scrubs Etc.)