Question

Which of the following inner lining of the stomach is protected from HCL?
(a)Pepsin
(b)Mucus
(c)Salivary amylase
(d)bile

Answer 1

It is a natural, slippery, and stringy fluid material formed by many of the body's lining tissues. In order to prevent vital organs from drying out, it is important for body function and serves as a protective and moisturizing layer. It also serves as a trap for irritants, such as dust, bacteria, or smoke.

Complete answer:
In order to protect the cell linings of that organ from the extremely acidic environment within it, a layer of mucus along the inner walls of the stomach is vital.
In the stomach wall, gastric mucus is a gel-mucous barrier secreted by epithelial cells and glandular cells. It serves as part of a membrane that protects the stomach wall within the lumen of the stomach from acid and digestive enzymes.
A film of dense mucus that is secreted by tall columnar epithelial cells often covers the mucosa. Gastric mucus is a glycoprotein that serves two purposes: to lubricate food masses in order to promote stomach movement and to form a protective layer over the lining of the stomach cavity epithelium.

Additional Information: Pepsin is an endopeptidase in which proteins are broken down into smaller peptides. It is formed in the main cells of the lining of the stomach and is one of the main digestive enzymes in humans and many other animals' digestive systems, where it helps digest food proteins.
Bile A dark-green-to-yellowish-brown fluid produced by the liver of most vertebrates is bile (from Latin bilis), or gall, which helps digest lipids in the small intestine. In humans, the liver (liver bile) constantly produces bile and it is processed and collected in the gallbladder.
Salivary amylase The main enzyme in the saliva is salivary amylase. Salivary amylase breaks down carbohydrates, including sugars, into smaller molecules. It helps the body digest starchy foods, such as potatoes, rice, or pasta, by breaking down large macromolecules into simpler components.
So, the correct answer is ‘mucus’.

Note: In the gastrointestinal tract, mucus is highly essential. It forms an important layer in the colon and small intestine that, by decreasing bacterial contact with intestinal epithelial cells, helps decrease intestinal inflammation.