What category is heroin-

They probably don't understand either 1. what the nightmare is about or 2. his anxiety and stress

Adescription of  congestive heart  failure, its symptoms, risk factors, and treatment. to the  heart muscle  other than by artery or blood  flow  problems; signs of  heart  failure may not  meanthe patient has  heart  failure and they quit alcohol, or at least consume alcohol within the national recommended  limits.

Ican only answer your first question, a machine is like a human body because it's a little similar. they both almost work like the same.