Mouth - The tongue and the teeth are found in the mouth. The inside of the mouth is lubricated with saliva that comes from the salivary glands. The teeth chew the food in to pieces to make it easier to digest. Saliva also contains an enzyme that breaks down starch.
Esophagus - From the mouth, food goes down the esophagus through the throat. The esophagus is a muscular tube that can open and close at the throat. It can also open and close to the stomach. The walls of the esophagus consist of smooth muscles. The wavelike movement of these muscles, called peristalsis, pushes the food down to the stomach.
Stomach - Once the food enters the stomach, gastric juices are used to break down the food. Some substances are absorbed muscle lining of the stomach.The stomach contains three layers of smooth muscles which also produce peristaltic movements to continue breaking down the food.
Intestines - Its wall are made of smooth muscles. The work of the small intestines is to digest food, which can then be absorbed by the blood. The work of the large intestine is to absorb water from the undigested food, hold the undigested food for a while and then excrete it as feces.
No comments:
Post a Comment