i majored in BME. there was a large amount of pure biomedical sciences but it was never the focus of what we were tested on or required to take away, for example we had to learn systems physiology, so our understanding of physiology, neuroscience, cariodovascular systems, circulatory systems, etc was required to be as good as bio majors taking similar physiology classes, but the big difference was the BME classes used the backdrop of the physiological system for considerably more application, and analytical probelm solving, with things like concepts of fluid mechanics, transport, turbulent flow, etc. on top of that the BME classes had true engineering components as well, on tests and labs we often had to model systems. another example, i took a BME class called neuropathophysiology, the first 2 lectures covered a comprehensive review of neuoranatomy, taught by an actual med school prof, then every lecture after that presented a module on a different pathophysiology like stroke, spinal cord lesions, ocular defects etc. After the first few mins of lecture everything went into modeling the system, characterizing the physiological phenomenon, like determining variables and modeling a formula for the amount of spasticity based on real data from a clinic from people with spinal cord lesions. in another class, cardiovascular instrumentation, we covered cardiothoracic anatomy and function, but then we focused on things like reading and monitoring ECG's, how ECG's work, the 12 lead system, etc, then using that kind of data to design pacemakers for different arrythmias, etc. the actual biomedical science aspect was always adjunct to application of theory, or problem solving.
so here's the deal as far as what i've been able to uncover from many who have made the jump from BME or ChemE to med school. we won't have the same type of demand on analytical problem solving, but while we have experience with covering a lot of material in biomedical sciences we will have to adjust to actually retaining and being able to reproduce large amounts of info, and not just manipulate or apply theories, relationships or equations.