Question

Ptyalin is inactivated by a component of gastric juice known as
A. Pepsin
B. Mucus
C. Renin
D. HCL

Answer 1

Hint: Ptyalin (a form of amylase) is present in saliva and is inactivated or destroyed in the stomachs of humans or animals. It is a type of protein enzyme. Activity of ptyalin is stopped when it is destroyed. HCl in the stomach denatures protein entering the stomach.

Complete answer:
> Option A is Pepsin
Pepsin is one of the main digestive enzymes in the digestive systems of humans and many other animals. It breaks down proteins into smaller peptides and helps to digest the proteins in food. It is produced by the chief cells of the stomach lining.

> Option B is Mucus
Mucus is produced by many lining tissues in the body. It is a normal, slippery, and stringy fluid substance for body function and works as a protective and moisturizing layer. It keeps important organs from drying out. Mucus also traps irritants like dust, smoke, or bacteria.

> Option C is Renin
Renin is also known as an angiotensinogenase. It is an aspartic protease protein and enzyme. It is secreted by the kidneys into circulation.

> Option D is HCL
HCL is one of the Stomach secretions. Hydrochloric acid breaks down, digest, and absorbs nutrients in the stomach such as protein. It also destroys bacteria and viruses in the stomach, protecting your body from infection.

Hence, the correct answer is option (D).

Note: Ptyalin is a form of amylase found in the saliva of humans and some other animals. It converts starch into dextrin and maltose. It is the most important amylolytic enzyme secreted by salivary glands in the mouth (buccal cavity) by the salivary glands.