The additional muscle layer in the stomach allows it to ____ food more vigorously than other digestive organs.

A. Motility is under the control of the sympathetic nervous system:Sympathetic innervation primarily inhibits gastrointestinal motility and induces sphincter contraction. Parasympathetic fibers from the vagus nerve and sacral plexus are the primary stimulators of motor activity. The sympathetic system acts as a functional brake.

B. Motility is movement of the GI tract:This term encompasses the various mechanical actions of the smooth muscle layers, including peristalsis and segmentation. These movements are essential for mixing and propelling luminal contents. It is a fundamental physiological process.

C. Peristalsis pushes food particles through the GI tract:Peristalsis involves a wave of proximal contraction followed by distal relaxation of the circular and longitudinal muscles. This coordinated sequence ensures the unidirectional, anterograde movement of the bolus. It is the primary propulsive motor pattern.

D. Digestion is the process of breaking food into nutrients:Digestion includes both mechanical reduction of food size and chemical hydrolysis of macromolecules into monomers. These processes occur along the entire length of the alimentary canal. It prepares molecules for epithelial absorption.

False:The serosa is the outermost layer of intraperitoneal organs only. Extraperitoneal structures, such as the esophagus and the distal rectum, are covered by adventitia instead. Adventitia consists of dense connective tissue that binds organs to surrounding structures.