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4 Cards in this Set
- Front
- Back
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What type of epithelium would you expect to find lining the alveoli (air sacs) of the lungs? Why is this epithelial type well suited to this location |
I would expect to find the simple squamous epithelium because it has a single layer of cells. Thicker types of epithelial cells would slow the process of gas diffusion to and from the blood. |
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Some types of epithelium have cellular extensions on their exposed surface. For example, the small structures known as microvilli can be found on the exposed surface of epithelial cells in the small intestine. In the respiratory tract, the exposed epithelial surface is covered by hairlike extensions called cilia. Describe the function of each surface structure in the examples given. |
The microvilli are short extensions of the plasma membrane that increase surface area and produce slight movements that increase absorption in the cell because the intestines need to be able to absorb as many nutrients as possible. Cilia are small hairlike extensions that would filter out dust and other particles that enter the exposed part of the respiratory tract. |
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During a lab practical, a student examines a tissue that is composed of densely packed protein fibers that are running parallel, forming a cord. There are only a few scattered cells with visible nuclei. The tissue has no striations, and there is no evidence of other cellular structures. The student identifies the tissue as skeletal muscle. why is the student's answer wrong, and what tissue is he or she probably observing. |
The student is wrong because skeletal muscle has striations made of actin and myosin and it has multiple nuclei per cell. He is most likely observing dense connective tissue. |
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While in the chemistry lab, Jim accidentally spills a small amount of a caustic chemical on his arm. what changes in the characteristics of the skin would you expect to observe, and what would cause these changes. |
The two steps to repair would be inflammation and regeneration. The first step, inflammation, would occur because of the chemical contact with his arm. His skin would would turn red, heat up, swell, and there would be pain. After a while, the skin would start to regenerate. |
