THORAX ABDOMEN AND PELVIS

Detailed explanation-1: -After ingestion, the solid hard materials are broken down into smaller pieces or chewed with the help of teeth. These food materials get mixed with the digestive juice called saliva secreted from the salivary gland by the movement of the tongue. Thus, this moist mixture forms ball-like structures called a bolus.

Detailed explanation-2: -A food bolus is formed as food is chewed, lubricated with saliva, mixed with enzymes and formed into a soft cohesive mass. 5 The bolus remains in the oral cavity (mouth) until the process of swallowing begins.

Detailed explanation-3: -The chewing and wetting action provided by the teeth and saliva shape the food into a mass called the bolus for swallowing. The tongue aids in swallowing by moving the bolus from the mouth into the pharynx.