Explain the process of digestion in stomach.
Partial digestion of food takes place here. Stomach releases gastric juice, which mainly contains hydrochloric acid and pepsin. Hydrochloric acid kills germ entering with the food and makes the food acidic. Pepsin helps in digestion of protein. Churning of stomach muscles physically breaks down food and mix it with the gastric juice and convert it into a semi-fluid called chyme.