ANATOMY

Detailed explanation-1: -The stomach is a J-shaped sac connecting the esophagus above and the small intestine below. The first part of the small intestine is known as the duodenum.

Detailed explanation-2: -The duodenum is the first part of the small intestine. It is located between the stomach and the middle part of the small intestine, or jejunum.

Detailed explanation-3: -Oesophagus. It is a muscular tube through which small bolus of food passes from the mouth to the stomach. The gastro-oesophageal sphincter controls the movement of food into the stomach.

Detailed explanation-4: -Muscles in the tongue and mouth work together to swallow the food and move it into the throat (pharynx). The pharynx (FAIR-inks) is a passageway for food and air.