THORAX ABDOMEN AND PELVIS

Detailed explanation-1: -[1] After sufficient digestion in the oral cavity, the partially digested foodstuff, or bolus, is swallowed into the esophagus. No digestion occurs in the esophagus. After passage through the esophagus, the bolus will enter the stomach and undergo mechanical and chemical digestion.

Detailed explanation-2: -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.

Detailed explanation-3: -The teeth aid in mechanical digestion by masticating (chewing) food. Mastication permits easier deglutition (swallowing) and faster chemical breakdown in the digestive tract. During mastication, salivary glands secrete saliva to soften the food into a bolus (semi-solid lump).

Detailed explanation-4: -Minor salivary glands – make the clear fluid (saliva) that keeps the mouth moist and contains enzymes to break down food. These glands are found in various locations around the mouth, including the inner cheeks.