Final answer:
The front end of a whale's stomach consists of the esophagus and a large, bag-like organ called the 'cardiac' stomach. It has multiple regions and digestive glands. The stomach wall has specialized layers and muscles for digestion.
Step-by-step explanation:
The front end of a whale's stomach consists of the esophagus, a short tube that connects the mouth to the stomach. The stomach of a whale is a large, bag-like organ known as the 'cardiac' stomach. It can be everted through the mouth during feeding. The stomach has multiple regions, including the cardia, fundus, body, and pylorus, and it contains digestive glands called pyloric caeca. The wall of the stomach is made of four layers, including a unique inner oblique smooth muscle layer that allows the stomach to vigorously churn and mix food.