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11 Nov 2019
ME- Membrane Transport The gastric juice in your stomach has a pH of 2.0. This acidity is due to the secretion of brotons into the stomach by epithelial cells of the gastric mucosa. Epithelial cells have an internal pH of 7.0 and a membrane potential of -70mV (inside is negative) and function at body temperature (37°C). 9. (1pt) What is the concentration of H outside the cell - in the stomach? 10. (1pt) What is the concentration of H inside the epithelial cell? (2pts) Calculate the change in free energy associated with the secretion of 1 mole of H into the gastric juice. 11. 12. (2pts) If protons were allowed to freely move back into the cell, calculate the membrane potential that would be required to prevent this backward movement. Hint -think about what happens to ÎG when solute movement stops.
ME- Membrane Transport The gastric juice in your stomach has a pH of 2.0. This acidity is due to the secretion of brotons into the stomach by epithelial cells of the gastric mucosa. Epithelial cells have an internal pH of 7.0 and a membrane potential of -70mV (inside is negative) and function at body temperature (37°C). 9. (1pt) What is the concentration of H outside the cell - in the stomach? 10. (1pt) What is the concentration of H inside the epithelial cell? (2pts) Calculate the change in free energy associated with the secretion of 1 mole of H into the gastric juice. 11. 12. (2pts) If protons were allowed to freely move back into the cell, calculate the membrane potential that would be required to prevent this backward movement. Hint -think about what happens to ÎG when solute movement stops.
Nestor RutherfordLv2
6 Feb 2019