Which of the following regulates the exit of waste material from the body?
Answer & explanation
Correct answer: option 3
The correct answer is Option (3) → Anal sphincter
Undigested food passes into the large intestine, where water is absorbed, and the rest is removed through the anus. The exit of this waste is regulated by a ring of muscle, the anal sphincter.
Why the other options are incorrect
Option (1) Small intestine — Incorrect. The site of complete digestion and absorption of food.
Option (2) Liver — Incorrect. The gland that secretes bile for digesting fats.
Option (4) Villi — Incorrect. Finger-like projections of the small intestine that absorb digested food.