Functions And Parts Of The Digestive System

 

 
 
Functions And Parts Of The Digestive System  

The digestive system in man starts with the alimentary canal. This is very long and can be divided into the buccal cavity, or the oral cavity, which contains the tongue, the teeth and the tonsils, the pharynx, the esophagus, the stomach, the small Intestine and the large intestine.

The buccal cavity is lined with the mucous membrane. The tongue is responsible for helping in tasting the food. It mixes saliva with food and helps in chewing by making the food soft and easy to break. The teeth help in breaking down the food. The tonsils are the site for the production of lymphocytes. These help remove the microorganisms which may enter the buccal cavity.

The pharynx is the cavity behind the soft palate. The esophagus is a muscular tube down which food passes by peristaltic movement of its wall. The stomach stores food till it is partially digested. It secretes gastric juice to help in digestion and also makes the hormone gastrin which stimulates the secretion of gastric juice. The small intestine is about 20 feet long and can be divided into three parts. They are duodenum, jejunum and ileum. The small intestine completes the process of digestion and also absorbs the digested food. It also secretes hormones which help in controlling the secretion of pancreatic juice, bile and intestinal juice. The large intestine is wider than the small intestine, and it is divided into caecum, colon and rectum. It helps in absorbing water from the food, secreting mucous and in excreting the undigested waste matter.

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How-Long-Is-The-Esophagus-In-The-Digestive-System      The esophagus is also known as the gullet. It is a muscular tube which is about 10 inches or 25 cm long. In humans, the esophagus is connected with the laryngeal part of the pharynx. It connects the mouth with the stomach. More..



 

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