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Module 10. Body Systems and Common Diseases
phinational.orgA body system is a group of body parts that work together to perform a specific function or task. All body systems are composed of cells, tissues, membranes, glands, and organs. Body cavities are spaces within the body that are protected by the skeleton and are occupied by components of the body systems.
Epithelial Structure - Yale University
medcell.med.yale.eduEpithelia are a collection of cells that form functional unit. Most epithelia form a sheet of cells. Epithelia line most body surfaces, including the skin digestive tract, respiratory tract and all body cavities. They form the functional unit and ducts of secretory glands. Epithelia are also the inner lining of all blood vessels and lymphatics.