juice is made up of substances secreted from parietal cells, chief cells, and mu
ID: 918320 • Letter: J
Question
juice is made up of substances secreted from parietal cells, chief cells, and mucous-secreting cells, i ne cells secrete HCI, photolytic enzyme zymogens, cumin, and intrinsic factor. The pH of gastric juice is acidic, between 1-3. If the pH of gastric Juice is 2.1, what is the amount of energy (AG) required for the transport of hydrogen ions from a cell (internal pH of 7.4) into the stomach lumen? Assume that the potential difference across the membrane separating the cell and the interior of the stomach is -60.0 mV (inside of cells negative relative to the lumen of the stomach). Assume that the temperature is 37 degree C.Explanation / Answer
We know delta G in this process = RT ln ([H+]in / [H+]out)
Lets find concentration of H+ = Antilog (-pH) =Antilog ( -2.1 )
= 0.0079
[H+] in = Antilog (-7.4) = 3.98 E-8
Lets plug in the values
Delta G = -8.314 J per (Kmol) x (37 +37.315 ) K x ln ( 3.98 E-8/ 0.0079 )
=31454.22 J
The energy needed = 31454.22 J
Lets find in kJ
= 31.4 kJ
The energy required for this transportation = 31.4 kJ
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