Those kinds of courses are largely considered upper division. I would not be surprised if there are many 3rd and 4th years in the class even if it is something that sophomores also take at this particular school.
I am currently selecting courses for my DIY postbacc this upcoming school year and would like to know whether taking a few 2nd year courses (just 1 or 2) - barring necessary prerequisites - is permitted. The courses in question are anatomy & physiology and medical microbiology.