Introduction to Digestive System:
Digestive system is the food processing system of human body. The whole digestive system is in the form of a long, hollow, twisted and turned tube, called the alimentary canal, which starts from the oral cavity and ends at the anus. The overall process of digestion and absorption of food occurs in this tube. The tube is divided into different parts on the basis of structure and function of each part. These parts are described below.
Parts of the digestive system
Human digestive system consists of the two categories of parts. The first category consists of those organs that are directly involved in the process of digestion and absorption. The second category consists of those organs that aid the process of digestion and absorption of food by producing chemical substances or by some other way, but are not directly involved in the process of digestion and absorption. The first category of organs may be called as “necessary organs” and the second category as “accessory organs” but it should be kept in mind that without the aid of accessory organs, the process of digestion is seriously impaired. When the accessory organs fail to perform their functions completely, the process of digestion may also completely stop.
Necessary Organs Of the digestive system:
- ORAL CAVITY
- SMALL INTESTINE
- LARGE INTESTINE
Accessory Organs of the digestive system:
- LIVER AND GALLBLADDER
- SALIVARY GLANDS
Functions of the digestive system:
As stated above, the digestive system is the food processing system of human body. The food taken by human beings is digested into simpler molecules that can be absorbed into the blood and utilized for various functions of human body. As the digestive system is the only route of intake of nutrients (in normal conditions), therefore necessarily all the nutrient requirements of human body are fulfilled by this system alone. If the digestive system is impaired for some reason, health of the affected individual will seriously decline.
Digestive System Outline:
|Functions||Digestion and absorption of food|