Answer the following question: Answer the following question given this paragraph: From the pharynx, the food moves into the esophagus. The esophagus is a long, narrow tube that passes food from the pharynx to the stomach by peristalsis. The esophagus has no other digestive functions. At the end of the esophagus, a muscle called a sphincter controls the entrance to the stomach. The sphincter opens to let food into the stomach and then closes again to prevent food from passing back into the esophagus. Q: What is the name of the muscle at the end of the esophagus? Choices: - neck - intestine - throat - sphincter A:
Answer:
sphincter