Parietal cells acidify the stomach contentswhile maintaining a neutral cytosolic pHby:exporting "excess" cytosolic OH as HCO3exchanging HCO3- for CIO preserving electroneutrality byaccompanying the movement of each CIion into the stomach lumen by a K+O All of the other are correct

Answered: Parietal cells acidify the stomach…

Human Anatomy & Physiology (11th Edition)

11th Edition

ISBN:9780134580999

Author:Elaine N. Marieb, Katja N. Hoehn

Publisher:Elaine N. Marieb, Katja N. Hoehn

Chapter1: The Human Body: An Orientation

Section: Chapter Questions

Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...

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Parietal cells acidify the stomach contents
while maintaining a neutral cytosolic pH
by:
exporting "excess" cytosolic OH as HCO3
exchanging HCO3- for CI
O preserving electroneutrality by
accompanying the movement of each CI
ion into the stomach lumen by a K+
O All of the other are correct

Expert Solution

Step 1: Parietal Cells

The human digestive system relies on a specific cell type known as parietal cells. Parietal cells are also known as oxyntic cells. The parietal cell is a kind of secretory epithelial cell that secretes hydrochloric acid. Because of the hydrochloric acid, the stomach juice is acidic (pH 2.0-3.7). These oxyntic cells are found in the inner stomach linings. In addition to hydrochloric acid, parietal cells produce an intrinsic factor that assists in the absorption of vitamin B12. Histamine, acetylcholine, gastrin, and other regulatory chemicals are examples of regulating substances that regulate oxyntic cell secretion at the central and local levels.

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