THORAX ABDOMEN AND PELVIS

Detailed explanation-1: -Animal digestion begins in the mouth, then moves through the pharynx, into the esophagus, and then into the stomach and small intestine.

Detailed explanation-2: -Humans and many animals have a monogastric digestive system. The process of digestion begins with the mouth and the intake of food. The teeth play an important role in masticating (chewing) or physically breaking down food into smaller particles. The enzymes present in saliva also begin to chemically break down food.

Detailed explanation-3: -Oral Cavity All mammals have teeth and can chew their food. The extensive chemical process of digestion begins in the mouth. As food is being chewed, saliva, produced by the salivary glands, mixes with the food. Saliva is a watery substance produced in the mouths of many animals.

Detailed explanation-4: -The mouth, or oral cavity, is the first part of the digestive tract. It is adapted to receive food by ingestion, break it into small particles by mastication, and mix it with saliva. The lips, cheeks, and palate form the boundaries.