Final answer:
To properly administer an enema, the liquid should be directed towards the navel when inserting the enema tip, aligning with the path of the sigmoid colon.
Step-by-step explanation:
When administering an enema, proper technique is crucial for both effectiveness and comfort. The liquid should be directed towards the navel when inserting the enema tip into the rectum. This direction aligns with the natural path the feces take during defecation, facilitated by the sigmoid colon which is S-shaped. As the enema solution flows in, it encourages the defecation reflex by stretching the rectal walls, similar to how feces accumulate and trigger this reflex naturally. It is essential to follow professional medical guidance when performing this procedure.