What is the main effect of cholinergic agents on gastrointestinal motility?

Cholinergic agents primarily enhance gastrointestinal motility due to their action on the parasympathetic nervous system. These agents stimulate muscarinic receptors in the smooth muscle of the gastrointestinal tract, leading to an increase in peristalsis and overall digestive activity. This enhancement in motility facilitates the movement of food through the digestive system, promoting effective digestion and absorption of nutrients.

The activation of cholinergic pathways can also increase secretions from salivary glands, gastric glands, and other digestive organs, further contributing to the process of digestion. Therefore, the main effect of cholinergic agents is to promote and increase motility in the gastrointestinal tract, making it easier for food to be propelled along the digestive pathway.