Final answer:
A cleansing enema stimulates the bowels to eliminate feces by introducing a liquid solution into the rectum, which triggers the reflex to defecate.
Step-by-step explanation:
A cleansing enema works by stimulating the bowels to eliminate feces. It involves introducing a liquid solution into the rectum, which helps to soften and lubricate the stool. The increased volume of liquid in the rectum triggers the reflex to defecate and promotes the contraction of the sigmoid colon and rectum. As a result, feces are eliminated from the rectum through the anus.