stomach,liver,and intestines
After food is swallowed it travels in soft lumps down the gullet into the stomach. This stretches as it fills,to hold 2 litres(3.5 pt) or more.The stomach is both food mixer and acid-and-enzyme bath.Every few minutes its strong,muscular walls undergo a spasm of squeezing to churn the food into a semiliquid called chyme.Only a few substances are actually absorbed through the stomach lining into the blood.