Histology - tissues can be distinguished based upon the...

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Histology Histology is the microscopic study of the structure of the tissues of the body. There are four types of tissues in the human body. In this lesson we discuss at length the first two: epithelial and connective. The last two, muscle and nervous, make up independent systems and will be discussed in depth at a later date. In previous lessons, we learned that the basic unit of life is the cell. Our bodies are kept healthy because the individual cells in our bodies are working to remain healthy. However, we are more than just clumps of cells working independently to stay alive. In fact, the cells in our bodies are specialized and are organized into tissue types. Each of our organs are made from two or more of these tissue types and organs work together as organ systems to perform the myriad functions that our bodies perform every day. Features of Tissues All cells differentiate during development and become the different cells of the tissues. These
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Unformatted text preview: tissues can be distinguished based upon the type and function of the cells within the tissue and the unique characteristics of the extracellular matrix (ECM, ECF , ground substance , basement membrane , interstitial fluid ). Epithelial cells secrete a mixture of carbohydrates and proteins into the extracellular environment that becomes the basement membrane. This basement membrane serves as an attachment site for epithelial cells. Epithelial cells are generally closely packed together with little ECM between cells. In contrast, connective tissues are characterized by significant amounts of ground substance with lots of fibrous proteins and complex carbohydrates but relatively few cells. The texture of the ground substance can vary from liquid (as found in blood) to stony (as found in bone) depending upon the types and functions of the proteins and carbohydrates secreted by connective tissue cells....
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