Anatomy and Physiology - your textbook -requires an access  code that came with the text
CDC - Centers for Disease Control
Karolinska Institute
Smithsonian Images
The MMRL:  Medical Reference Library
Virtual Cell
CELLS alive!
CYTOPATHNET
Biology: Images &Multimedia Sites
The Interactive Heart
The Internet Pathology Laboratory for Medical Education
MedWeb
Dynamic Human 2
the JayDoc HistoWeb
Mayo Clinic Health Oasis
New England Journal of Medicine
WebMD
InteliHealth - Home to Johns Hopkins Health I...
Amazing Science Web Sites
Pub Med - an archive of journal articles maintained by the NIH