Answer the following question given this paragraph: 

sphincter, but the esophagus remains closed when there is no swallowing action. Acid reflux or “heartburn” occurs when the acidic digestive juices escape into the esophagus. Stomach A large part of digestion occurs in the stomach, shown in Figure 34.11. The stomach is a saclike organ that secretes gastric digestive juices. The pH in the stomach is between 1.5 and 2.5. This highly acidic environment is required for the chemical breakdown of food and the extraction of nutrients. When empty, the stomach is a rather small organ; however, it can expand to up to 20 times its resting size when filled with food. This characteristic is particularly useful for animals that need to eat when food is available.


Q: What is the cause of the “heartburn” that occurs when acidic digestive juices escape into the esophagus?

 Choices:

- toxic reflux

- acidic buildup

- acid pressure

- acid reflux

A:
acid reflux
