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Physiology

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GIT

Question
9 out of 19
 

In stomach the acid is secreted by:



A HCO3- is exchanged for K+
B H+, Na+

C Active secretion
D Passive secretionm

Ans. C Active secretion

The last step in hydrogen ion ACTIVE SECRETION is achieved by an H+, K+ - ATPase “proton pump” which is located in the apical microvillus membrane and tubovesicular apparatus of the parietal cells of stomach. This PROTON PUMP exchanges hydrogen for potassium across the microvillus membrane.

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