Which statement concerning the parasympathetic nervous system is correct?

The statement about the parasympathetic division being involved in near vision, movement of food, and urination is accurate because these functions align with the classic role of the parasympathetic nervous system, which is often described as responsible for "rest-and-digest" activities.

This division promotes bodily functions that help conserve energy and facilitate digestion and other restorative processes. For instance, it aids in near vision through the contraction of the ciliary muscles in the eye, allowing for adjustment of the lens to focus on close objects. Furthermore, the parasympathetic system enhances gastrointestinal motility and secretion, effectively promoting peristalsis and the movement of food through the digestive tract. It also plays a critical role in regulating urinary functions by controlling bladder contraction and the relaxation of the sphincters, facilitating urination.

In contrast, the other statements do not accurately reflect the characteristics of the parasympathetic nervous system. The system typically functions in a more localized manner, rather than discharging as a single unit; the postganglionic fibers are relatively short, in comparison to the long preganglionic fibers, and it does not control adrenal medulla secretion, as that is primarily a function of the sympathetic nervous system.