The Biology of Cells and Tissues course consists of lectures and coordinated laboratory sessions that introduce the fine structure and function of cells, tissues, and organ systems of the human body, primarily as observed at the resolution of light and electron microscopy.  Emphasis is placed on structure-function relationships between different cell types in human tissues and organ systems, as well as on how alterations in cell architecture and cell behaviors lead to disease.  The first part of the course covers the functional morphology of cells and their organelles, the biochemical composition of cellular components and products, features of cell surfaces and cellular movement, and the basics of cell-cell and cell-matrix interactions.  The remainder of the course is a systematic survey of the body's organ systems, with an emphasis on the functions of specialized cell types in each organ.  Approximately 50 hours are devoted to laboratory exercises that serve as a foundation for understanding pathology in the second year.