THORAX ABDOMEN AND PELVIS

Detailed explanation-1: -bolus, food that has been chewed and mixed in the mouth with saliva. Chewing helps to reduce food particles to a size readily swallowed; saliva adds digestive enzymes, water, and mucus that help chemically to reduce food particles, hydrate them for taste, and lubricate them for easy swallowing.

Detailed explanation-2: -The process of digestion begins as soon as the food is taken into the mouth. The teeth, tongue and saliva helps to convert the food into a soft moist ball called a bolus which is easy to swallow.

Detailed explanation-3: -During mastication, the food mixes with the saliva to form a bolus, which is a rounded, smooth, and lubricated portion of mechanically broken down food.