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What is Mass movement of the colon would be abolished by and explain in detail?
Mass movements are special type of peristaltic contractions which are observed in colon only. A mass movement can be initiated by Gastrocolic reflex Intense stimulation of parasympathetic nerves Overdistension of a segment of colon Gastrocolic reflex refers to contraction of colon induced by entry of food into the stomach. This reflex results in an urge to defecate after a meal. Gastrocolic reflexes results from distension of stomach & duodenum & these are transmitted by way of autonomic nervous system. Trypanosoma cruzi, a species of parasitic euglenoid protozoan causes destruction of Auerbach&;s plexus in walls of colon which leads to the blockage of both the peristalsis & mass contractions. Therefore, the feces pass with difficulty & get accumulated in large intestine leading to dilatation of colon (megacolon). Reference: Medical Physiology, Indu Khurana