Question

the epithelial layers of the stomach protect the organ by:
a. secreting anti-amylase
b. removing hydrogen ions from the gastric juice using ATPase pumps
c. releasing antihistamine
d. joining cells with tight junctions
e. forming a later of acidic mucus over the cell surface

Answer 1

the epithelial layers of the stomach protect the organ by:

Answer:-

d. joining cells with tight junctions

Explanation:-

The epithelial layers of the stomach protect the organ by producing a bicarbonate-rich mucus that coats the mucosa. Bicarbonate is alkaline, ( not acidic) thus it neutralizes the acid (HCl) secreted by the parietal cells. Thus by providing continuous supply of bicarbonate through mucosa, the stomach get protected. Therefore

Firstly, the stomach wall is covered by a thick coating of bicarbonate-rich mucus secreted by epithelial cells. This alkaline mucus forms a physical barrier, and its bicarbonate ions neutralize acid.

Now, secondly, the epithelial cells of the stomach’s mucosa meet at tight junctions, which block gastric juice from penetrating the underlying tissue layers and thus protect the stomach.