College classes taken through a CC or a public university count towards your GPA in college (assuming the credits transfer correctly), and your GPA in college is sent to medical schools.
I've taken enough college classes to be a sophomore in college. I stayed at my high school to take the classes, but they were UT Chattanooga courses and credits (which transferred to Knoxville no problem).
P.S., make sure the credits can transfer. The salutatorian at my high school took two classes at a local CC, and neither of the credits transferred. The courses were not the same, even though they covered the same subject.