Srudy the prepared slide of nerve cells called neurons. In an individual neuron,

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Srudy the prepared slide of nerve cells called neurons. In an individual neuron, distinguish the nucleus-containing cel body and the Slamentous processes growing out from the cell body. These processes, or fibers, are called dendrites if they carry impulses toward the cell body and axons if they carry impulses away from the cell body. Egithelial tisse forms a continuous layer, or sheet, over the entire body surface and most of the body's inner cavities. On the external surface it forms a covering that, like the epidermis in plants, protects the animal from injury and drying out. On internal surfaces, this tissue may be specialized for other functions in addition to protection, as we will discuss. Epithelial Tissue There are three types of epithelial tissue: squamous, cuboidal, and columnar. Each type may be simple or stratiied. Simple means that there is only one layer of cells; stratified means that there are layers piled on top of each other. Some epithelial tissu tensions called microvilli. Simple Squamous Epithelium ues are pseudostratified, meaning that while the cells appear to be layered, each one touches the baseline ore true layers do not exist. Each type of epithelium may have hairlike extensions called ela or cellular ex- slide of a surface view of frog skin. In ow power, note the close packing of the fat cells (ig. 8.6). What is the shape of the cells?irellar In high power, examine an individual cell and identify cell membrane, cytoplasm, and nucleus. Estimate the size of an Recall your observation of human cheek -The function of this tissue is protection. epidermal cell by your knowledge of the diameter of the field. 1 -cells (p. 11). What type of tissue lines the mouth?--Ain Simple Cuboidal Epithelium Study the model of simple cuboidal epithelium and then examine the prepared slide of sections through kidney tubules (ig. 8.7). Move the slide until you locate a section through a duct. You will recognize this area because there will be a space with cells around it. Note, then, that the epithelial tissue may line cavities in the body. What geometric shape -describes the structure of these cells? The function of these cells is absorption Simple Colummar Epithelium Study the model of simple columnar epithelium and then examine the prepared slide of a cross section through the f intestine. Focus on the innermost layer that lines the intestine. The cells you are looking for are tall and narrow (fig 8.8). In high power,focus on an individual cell Iidentitfy the boundary of the cell membrane, the cytoplasm, the nucleus and chromatin granules. What geometric shape describes the structure of these cells? function of these cells is absorption. The Figure 8.6 Simple squamous epithelial tissue. a. Drawing. b. Photomicrograph. nucleus membrane cytoplasm @t 8-6 b.

Explanation / Answer

Simple squamous epithelium:

Cells are flat. They are wider than taller. The average diameter of epidermal cell is 100 uM. Mouth is lined by simple squamous epithelium.

Simple cuboidal epithelium shape is cuboidal. The height and width of the cells are almost similar.

Simple columnar epithelium has cylindrical shape. Their height is more than its width.

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