Final answer:
The esophageal section of the stomach, known as the cardiac region, is where the esophagus attaches to the stomach and is located just inferior to the diaphragm. Supported by the lower esophageal sphincter, this region controls the passage of food into the stomach and prevents backflow into the esophagus.
Step-by-step explanation:
The esophagus is a muscular tube responsible for moving food from the mouth to the stomach. The esophageal section of the stomach is referred to as the cardiac region, which is where the esophagus connects to the stomach. It is this section through which food passes from the esophagus into the stomach. The cardiac region is named as such because it is close to the heart. It is found inferior to the diaphragm and is part of the upper portion of the stomach.
Directly below the diaphragm, the cardiac region provides the entry point for swallowed material. It is supported by a ring-like muscle known as the lower esophageal sphincter or gastro-esophageal sphincter. This sphincter prevents the contents of the stomach from re-entering the esophagus, thereby avoiding the common discomfort of acid reflux or heartburn when it functions properly.