Homo sapien
The digestive system of humans is one of the most complex of all animals in the world. The system begins with the mouth, which contains saliva and many teeth, which both help grind the food down to help with further digestion. This enzyme helps break down food for the stomach and for the rest of the digestive system. After entering through the mouth, the food is pushed down by the tongue. The food passes the epiglottis, the gag reflex flap, and down to the oropharynx. After the oropharynx the food passes down to the esophagus and down to the stomach. Once in the stomach the enzymes in the stomach break down the food and helps turn it into chyme. Once it passes the stomach, it enters the small intestines where chemicals from the pancreas break it down further. As it moves down the small intestines the villi, which line the entire small intestines, absorb all of the nutrients that remains in the food. Once all the nutrients are absorbed the chyme passes through the rectum, and then finally the anus, getting rid of the excess chyme.