NEET BIOLOGY

Detailed explanation-1: -Hydrochloric acid is the primary digestive acid and has several roles in digestion. Hydrochloric acid secreted by the stomach kills germs that enter along with food.

Detailed explanation-2: -In Stomach HCl (hydrochloric acid) present which is highly acidic in nature. These acid kills the bacteria which came with food. This acid also helps to break food particles into small particles.

Detailed explanation-3: -Germs that pass on to the human body through food are killed in the alimentary canal since the pH level is around 2 making this a very acidic. Germs cannot survive through acidic conditions and get killed.

Detailed explanation-4: -Food often contains bacteria, but the HCl of the stomach is effective in killing most ingested microbes. The pharyngeal-esophageal phase of swallowing is involuntary and is controlled by the swallowing center in the thalamus and lower pons.

Detailed explanation-5: -The hydrochloric acid in the gastric juice breaks down the food and the digestive enzymes split up the proteins. The acidic gastric juice also kills bacteria.