All substances that enter the body must cross an epithelium. Selective permeability: The cells of an epithelium act as gatekeepers of the body controlling permeability and allowing selective transfer of materials across a physical barrier.Protection: Epithelial tissues provide the body’s first line of protection from physical, chemical, and biological wear and tear.Muscle tissue contracts to cause movement, while nervous tissue sends electrical signals to allow communication throughout the body. Muscle tissue and nervous tissue will be covered in the next module. We will cover epithelial tissue and connective tissue in this module. Connective tissue binds together, protects, and supports structures of the body. Epithelial tissue, also referred to as epithelium, refers to the sheets of cells that line all surfaces of the body. There are four categories of tissues: epithelial, connective, muscle, and nervous. An organ system is a group of organs that work together to perform major functions or meet physiological needs of the body. Each organ performs one or more specific physiological functions.
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