What is the role of the esophagus in the digestive system?

The esophagus plays a crucial role in the digestive system by serving as a transport tube that moves food from the mouth to the stomach. This process begins when food is swallowed; the esophagus utilizes coordinated muscle contractions known as peristalsis to propel the food downward. The esophagus does not participate in nutrient absorption, mixing food, or producing digestive enzymes, as these functions are carried out by other parts of the digestive system.

For example, nutrient absorption primarily occurs in the small intestine, where digested food is absorbed into the bloodstream. The stomach is responsible for mixing food with gastric juices and initiating the digestion of proteins, while digestive enzymes are produced mainly by the pancreas and the lining of the small intestine. Therefore, the primary function of the esophagus is to facilitate the movement of food, making option B the correct choice.