Biology: The Unity and Diversity of Life
Biology: The Unity and Diversity of Life
15th Edition
ISBN: 9780357093795
Author: STARR
Publisher: CENGAGE LEARNING (CUSTOM)
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Chapter 39, Problem 4CT

Cholera is a disease caused by bacteria that make cholera toxin. In the presence of this toxin, chloride ion channels in cells of the small intestine lining are stuck in their open position. As a result, an excess of chloride ions (Cl) flows from these cells into the lumen of the small intestine. Movement of Cl creates a charge gradient, so sodium ions (Na+) also flow into the lumen. Explain why the movement of these ions into the lumen results in the life-threatening diarrhea that characterizes cholera.

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Which is a correct statement about the Na+/K+ transporter (pump), and its cytology and cellular role?     It is found the basal side of intestinal epithelial cells, pumping Na+ out of the cell into the blood.     It is found on the plasma membrane of neurons, pumping Na+ into axons from the blood.     It is found on the membrane of the lysosome, pumping K+ into the lumen of the lysosome.     It is found on the apical side of intestinal epithelia, pumping K+ into the lumen of the intestine.
If a mutation in a sodium channel in an Intestinal epithelial cell caused a marked decrease In the concentration gradient of sodium across the plasma membrane, which of the following would you expect to observe? a decrease in Na/K ATPase activity. an increase in the movement of glucose across the basolateral membrane to the extracellular space an increase in sodium/glucose co-transport into the cell across the apical membrane a decrease in cytoplasmic glucose concentration
Some of the intestinal epithelial cells, called goblet cells, contain small globules of mucus. Why are there cells in the small intestine that produce mucus?
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