Microanatomy Web Atlas, Gwen V. Childs, Ph.D.
University of Texas Medical Branch, Cell Biology, provides the study of various structures complete with photos. Included are practical exams, study guides, an atlas of microscopic cells and tissues, and a slide show.
The Biology Project: University of Arizonas Department of Biochemistry and Biophysics site provides problem sets and tutorials for Biochemistry, Cell Biology, Chemicals and Human Health, Developmental Biology, Human Biology, Immunology, Mendelian Genetics, and Molecular Biology. Problem sets and tutorials are active but not the visualization activities.
Cells Alive: On-line educational resource site covers topics in Cell Biology, Microbiology, Immunology and Microscopy. The majority of the site is freely accessible and includes film and computer-enhanced images of living cells and organisms, interactive models, Cell Biology and Immunology quizzes, etc.
Cell and Tissue Structure/Physiology: Self-study pages, practice questions, lecture handouts and images are provided.
iBioSeminars - Video Lecture of Adhesion, Signaling and Cancer: The American Society of Cell Biology provides this cancer iBioSeminar on their website. The lecture was created by the Huntsman Cancer Institute, University of Utah.
Epithelial Cells: Overview, structure, function of epithelial cells in a module created by students at Davidson College.
Action Potential: This website gives a general description of ECG tracings and describes various ranges of action potential as well as QRS complexes.