THORAX ABDOMEN AND PELVIS

Detailed explanation-1: -Once food is moistened and rolled and ready to swallow, it is known as a bolus. Swallowing occurs when the muscles in your tongue and mouth move the bolus into your pharynx. Waves of muscle movement, called peristalsis, move the bolus down to the stomach.

Detailed explanation-2: -Mechanical breakdown starts with mastication (chewing) in the mouth. Teeth crush and grind large food particles, while saliva provides lubrication and enables food movement downward. The slippery mass of partially broken-down food is called a bolus, which moves down the digestive tract as you swallow.

Detailed explanation-3: -Mechanical Digestion The large pieces of food that are ingested have to be broken into smaller particles that can be acted upon by various enzymes. This is mechanical digestion, which begins in the mouth with chewing or mastication and continues with churning and mixing actions in the stomach.