Question

what kills bacteria in our food in the mouth and stomach.​

Answer 1

Answer:

The enzyme lysosome in saliva kills

bacteria in food in our mouth and in stomach hydrochloric acid of gastric juice kills the bacteria.

Answer 2

Answer:

Explanation:

Digestion in the Stomach:-

When food reaches the stomach, it stays for approximately 4 to 5 hours. There are various gastric glands in the mucosa lining of the stomach. The mucus neck cells secrete mucus. The Peptic Cells secrete the proenzyme pepsinogen. The Parietal or Oxyntic Cells secrete HCl (Hydrochloric acid) and intrinsic factor that is essential for vitamin B12 absorption.

Gastric juices and enzymes:

•HCl provides the acidic pH.

•Pepsinogen(proenzyme) is converted into Pepsin by HCl

•Pepsin, in turn, converts protein into peptones & proteoses.

•Prorenin (proenzyme) is converted into Renin by HCl.

•Casein (milk protein) is converted into peptides by Renin.

Digestion in the Oral Cavity:-

When food is taken in through the mouth, chewing and mixing of the food occurs. There is also a chemical breakdown of carbohydrates, due to the action of saliva from the salivary glands. 30% of the starch is hydrolyzed by the action of amylase, which is a salivary enzyme. The other enzyme, lysozyme is an antibacterial agent that prevents infections.

Starch + Salivary amylase → Maltose