Which of the following describes the parasympathetic nervous system's effect on digestion?

The parasympathetic nervous system is primarily responsible for promoting the body's "rest-and-digest" activities. Its effects on digestion are largely stimulatory, facilitating various digestive processes.

When activated, the parasympathetic nervous system increases salivary gland activity, which is critical for the initial digestion of carbohydrates and helps lubricate food for swallowing. This stimulation also enhances gastrointestinal motility, meaning that it increases the contraction of smooth muscles in the digestive tract, promoting peristalsis—the wave-like motion that propels food through the digestive system. Additionally, it encourages the production of digestive enzymes and gastric secretions, which are necessary for breaking down food components efficiently.

Overall, the correct answer reflects the overall stimulating influence the parasympathetic nervous system has on the digestive process, helping ensure that the body can effectively digest and absorb nutrients after a meal.