Through which of the following parts of the digestive system does ingested food travel?

Ingested food travels through the oesophagus and the stomach as part of the digestive process.

The oesophagus is a muscular tube that connects the mouth to the stomach. Its primary function is to transport food and liquids from the mouth to the stomach for digestion. The walls of the oesophagus contract and relax, using peristalsis, to push the food towards the stomach.

The stomach is a muscular sac that receives food from the oesophagus and mixes it with digestive juices to break it down into a liquid form that can be further processed by the small intestine.

The gallbladder, on the other hand, is an organ located beneath the liver, which stores and concentrates bile produced by the liver. 

The kidneys are part of the urinary system, and their primary function is to filter waste products from the blood and excrete them from the body in the form of urine. They do not play a role in the digestion of food.