Explain peristalsis, haustral churning, and mass movement that are involved in the movement of the chyme/feces through the large intestine. 1. Explain completely the process of defecation including both the involuntary reflex. Be sure to include the five components of a reflex arc. Also include how defecation is controlled through voluntary components including the cerebral cortex and the Valsalva maneuver. 2. Describe what occurs if defecation is delayed.