AP BIOLOGY

Detailed explanation-1: -Esophagus: The esophagus is a muscular tube that connects the pharynx (throat) to the stomach. The esophagus contracts as it moves food into the stomach. A “valve” called the lower esophageal sphincter (LES) is located just before the opening to the stomach.

Detailed explanation-2: -The cardia is the first part of the stomach, which is connected to the esophagus. It contains the cardiac sphincter, which is a thin ring of muscle that helps to prevent stomach contents from going back up into the esophagus.

Detailed explanation-3: -Pharynx-is the muscle-lined space that connects the nose and mouth to the larynx and esophagus (eating tube).

Detailed explanation-4: -The lower esophageal sphincter (LES) is a bundle of muscles at the low end of the esophagus, where it meets the stomach.

Detailed explanation-5: -TooltipReadMore is the hollow tube that leads from the throat (pharynx) to the stomach. Food does not just fall through the esophagus into the stomach. The walls of the esophagus propel food to the stomach by rhythmic waves of muscular contractions called peristalsis.