Final answer:
The mixture known as chyme moves from the stomach to the small intestine through the pyloric sphincter, where it continues the digestion process by mixing with bile.
Step-by-step explanation:
The fluid mixture moving from the stomach through the pyloric sphincter is called chyme. Chyme is a thick, semi-liquid mixture of partially digested food and digestive juices. When the small intestine is ready to receive this mixture, the pyloric sphincter opens, permitting the passage of chyme from the stomach into the small intestine for further digestion.
In the small intestine, chyme mixes with bile, which helps in the emulsification of fats, preparing them for further digestion and absorption. The process of the stomach emptying its contents into the small intestine is known as gastric emptying, which is crucial for efficient digestion.