1. Frog skin is an excellent system for studying sodium transport across an epithelium. Frog skins is stripped from the frog's leg and tied into a sack. The inside of the sack is the internal (extracellular fluid) surface of the frog skin. The sack is filled with normal frog saline and the filled sack is placed in a beaker filled with the same saline. The recording electrode of a voltmeter is placed inside the sack and the ground electrode is placed in the bath. a. (Draw a picture to help you visualize this arrangement.) b. When the electrodes are first placed, there is no transepithelial potential difference. c. After an hour, the transepithelial potential is +20, inside the sack relative to outside.

1. Frog skin is an excellent system for studying sodium transport across an epithelium. Frog skins is stripped from the frog's leg and tied into a sack. The inside of the sack is the internal (extracellular fluid) surface of the frog skin. The sack is filled with normal frog saline and the filled sack is placed in a beaker filled with the same saline. The recording electrode of a voltmeter is placed inside the sack and the ground electrode is placed in the bath. a. (Draw a picture to help you visualize this arrangement.) b. When the electrodes are first placed, there is no transepithelial potential difference. c. After an hour, the transepithelial potential is +20, inside the sack relative to outside.

Biology: The Dynamic Science (MindTap Course List)

4th Edition

ISBN:9781305389892

Author:Peter J. Russell, Paul E. Hertz, Beverly McMillan

Publisher:Peter J. Russell, Paul E. Hertz, Beverly McMillan

Chapter48: Regulating The Internal Environment

Section: Chapter Questions

Problem 2TYK

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