Digestive System. Introduction

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 tube is divided into different parts. These parts are described below.

Parts of 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. They may be called “necessary organs”

The second category consists of those organs that assist the process of digestion and absorption of food by producing chemical substances. They may be called “accessory organs”.

Necessary Organsof the digestive system	Accessory Organs of the digestive system:
1. ORAL CAVITY 2. ESOPHAGUS 3. STOMACH 4. SMALL INTESTINE 5. LARGE INTESTINE 6. ANUS	1. LIVER AND GALL BLADDER 2. PANCREAS 3. SALIVARY GLANDS 4. TEETH 5. TONGUE

Functions of digestive system:

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 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 individual will seriously decline.

The small intestine is the longest part of our digestive system - about twenty feet long! It connects your stomach to your large intestine (or colon) and folds many times to fit inside your abdomen. Your small intestine does most of the digesting of the foods you eat. It has three areas called the duodenum, the jejunum, and the ileum.

The large intestine is the part of the digestive system most responsible for absorption of water from the indigestible residue of food. The ileocecal valve of the ileum (small intestine) passes material into the large intestine at the cecum. Material passes through the ascending, transverse, descending and sigmoid portions of the colon, and finally into the rectum. From the rectum, the waste is expelled from the body.

Дата добавления: 2015-07-20