textbook compound microscope prepared slides of the following epithelial tissues: simple squamous epithelium (lung) simple cuboidal epithelium (kidney) simple columnar epithelium (small intestine) pseudostratified (ciliated) columnar epithelium (trachea)
stratified squamous epithelium (esophagus) transitional epithelium (urinary bladder)
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A tissue is composed of a layer or group of cells— cells that are similar in size, shape, and function. Within the human body, there are four major types of tissues: (1) epithelial, which cover the body's external and internal surfaces; (2) connective, which bind and support parts; (3) muscle, which make movement possible; and (4) nervous, which conduct impulses from one part of the body to another and help to control and coordinate body activities.
Epithelial tissues are tightly packed single (simple) to multiple (stratified) layers of cells that provide protective barriers. The underside of this tissue layer contains a basement membrane layer to which the epithelial cells anchor. Epithelial cells always have a free surface that is exposed to the outside or to an open space internally. Numerous shapes of the cells exist that are used to name and identify the variations. Many of the prepared slides contain more than the tissue to be studied, so care should be taken to be certain that your view matches the correct tissue. Also be aware that stained colors of all tissues might vary.
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This ebook provides an introductory explanation of the workings of the human body, with an effort to draw connections between the body systems and explain their interdependencies. A framework for the book is homeostasis and how the body maintains balance within each system. This is intended as a first introduction to physiology for a college-level course.