Which process increases the activity of peristalsis in the intestines?

The process that significantly increases the activity of peristalsis in the intestines is eating a meal. When food enters the gastrointestinal tract, it stimulates the walls of the intestines, which in turn triggers the muscular contractions known as peristalsis. This contraction helps to propel the food through the digestive system, ensuring it is mixed with digestive juices and breaking it down into smaller particles for absorption. The presence of food in the stomach and intestines activates the digestive process, signaling the nervous system to enhance peristaltic movement. This is a critical function in maintaining efficient digestion and aiding in the movement of contents through the digestive tract.

While activities like drinking water, exercising, and even sleeping may have some effects on peristalsis, none are as direct and impactful as the act of eating. Drinking water can help to maintain hydration and may assist in digestion, but it doesn't have the same stimulating effect as the intake of solid food. Exercising can promote general digestive health and stimulate the digestive tract over time, but it does not initiate the active process of peristalsis in the same immediate way that eating does. Finally, sleeping typically reduces digestive activity, allowing the body to rest rather than actively digest food.