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Question: 2225 and essay...

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22-25 and Essay
22. The epidermis a) is classified as pseudostratified columnar epithelium b) allows uncontrolled water loss from the body c) might include keratinocytes, melanocytes, Merkel cells and Langerhans cells d) All the above (a, b and c) are correct 23. Cartilage a) does not contain blood vessels b) is highly negatively charged because of sugars and sulfate groups attached to sugars e) absorbs large amounts of water which acts as a shock absorber when pressure is applied to the tissue d) All the above (a, b, and c) are correct 24 Steroid hormones that activate a cel a) generally easily cross plasma membranes b) bind to specific cytoplasmic receptors on target cells e) tum on a gene to produce a new protein to effect a change in the cell 25. Comparison of the ion concentrations of cell cytoplasm with the extracellular fluid would show that a) Potassium concentration inside the cell is the same as outside b) Sodium concentration inside the cell is lower c) Calcium concentration inside the cell is much higher d) All the above (a, b, c) are correct ESSAY. Deseibe the structure of a generalized plasma membrane. Include the major components (lipids, proteins, glycolipids, polysaccharides) Describe transport mechanismis by which materials move into and out of cells. (25 pts)
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