College Essay

291 WordsMar 19, 20152 Pages
Tissues In this report I am going to outline the structure of the main body tissues in the body. Tissues are a group of cells that function together to make one unit. The tissues are epithelial, connective, muscle and nervous. Epithelial tissue This tissue is widespread throughout the body. They form the covering of all the body surfaces. They line the body cavities and hollow organs. Epithelial tissue performs a variety of functions. These functions are: * Secretion * Absorption * protection * excretion * filtration * diffusion * sensory reception The cells in the epithelial tissues are tightly packed together. This is because the tissues form covering and lining. The cells have on free surface that is not in contact with other cells. Opposite the free surface, there are cells that are attached to the underlying connective tissues and this is by a non-cellular. Epithelial cells vary and can be in single or multiple layers. The layers are simple squamous, simple cuboidal, simple columnar, transitional, stratified squamous, stratified cuboidal and the psuedostratisfied columnar. Epithelial cells can be simple or compound. The functions of these cells are: 1. Squamous- this is a flat cell that is found in walls of the lungs alveoli and blood capillaries. 2. Cuboidal- this is cube shaped and it lines ducts and thyroid. It allows material to pass through. 3. Columnar- this cells has a tall structure and is found in the trachea, bronchi in small intestine 4. Traditional epithelial- this can be distended or stretched 5. glandular epithelial is specialised to produce the secrete substances The lining of the internal and external surfaces can be compound or simple, the lowest layer I attached to the basement membrane for the support and the connection. The main functions are diffusion and osmosis.

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