The cardiovascular/circulatory system contains a functional 3d heart (50 parts) with "insight" (transparent windows) and detailledly modeled valves, other heart interiors (atria & ventricula) and coronaries. The 3d anatomical (cardiovascular circulatory system) blood vessel set fits very nicely and without interference, in wuth the skeleton, muscles and all other parts of the P1 3d anatomy set.
