HUMAN NUTRITION

Detailed explanation-1: -When you put food in your mouth, your teeth break the food into smaller pieces, and the salivary glands under your tongue and on the sides and roof of your mouth release saliva. This saliva mixes with your food to make it easier to swallow.

Detailed explanation-2: -Food is crushed into small pieces by the teeth. The food is then mixed with saliva and the enzyme amylase (found in saliva) breaks down starch into sugars. The tongue helps in thorough mixing of food with saliva. Food goes directly through the oesophegus to the stomach, there is no breakdown of food in mouth .

Detailed explanation-3: -Mechanical digestion in the oral cavity consists of grinding of food into smaller pieces by the teeth, a process called mastication.

Detailed explanation-4: -A digestive organ, your tongue moves food around your mouth to help you chew and swallow. It also helps you make different sounds so you can speak and form words clearly. Your tongue helps keep your airway open so you can breathe properly, too.