Skeletal: Silence Muscular: being patient Circulatory: doing it's job Nervous System: nervous Digestive System: Oh gosh.... Reproductive System: Working, The egg and sperm are mating btw- Respiratory: breathing Immune system: fighting your sickness Lymphatic: helps Immune Urinary: cleaning blood Endocrine: he's never tired Integumentary: bored the Doctor is sleeping, and it's literally 3am, you can fuck off with the other systems or do whatever