How many distinct entities or structures do you see participating in the process?

Last week i was assigned a thematic. we have groups of three but the people i was assigned with haven't been in school for days. i would appreciate if anyone can me with my thematic . i highlighted most of the important steps and i circled my thematic topic. in desperate need : ( its due on february 19

Patient has just received an organ transplant which treatment would be most effective in preventing the patient’s body from

Which of these parts of the membrane large moecules pass through it ?