Tell me about human alimentary canal
Answers
The digestive system from Oesophagus to the anus is called alimentary canal. It's about 9 m long!
It constitutes following organs namely :
a. Buccal cavity
b. Oesophagus
c. Stomach
d. Small intestine
e. Large intestine
f. Rectum
g. Anus.
Function of the above given respectively :
a. Buccal cavity :
Human take in food through mouth. where which salivary enzymes breaks down starch into sugar.
b. Role of Oesophagus :
It allows passage of food from Buccal cavity to the stomach.
c. Role of Stomach :
Here HCL, mucus and several digestive enzymes mixed with food. Where which HCL males food acidic fit enzymes to action.
d. Role of Small intestine :
This tube has three main divisoms namely - Duodenum, jejunum and ileum. Duodenum is responsible for mixing bile and pancreatic juice with food. Jejunum is middle part going only in man.
Total absorption takes place in the ileum. This ileum has villi on the surface. This villi increases area for absorption. The villi have blood vessels, digested food passes villi to there and enters the blood stream. Which then transfer to liver and then to the heart ♥ .
e. Role of large intestine, anus and rectum :
Food from small intestine moves there. Here the most of water and salt be removed from the waste by absorbtion. This intestine all the passage of faecal matter through the anus.
The human alimentary canal starts from mouth and ends at anus.
Mouth contain oral cavity. And oral cavity contains teeth. Teeth help in chewing of food and in many other works like grinding and tearing.
Tongue is also present in oral cavity which help in mixing of saliva in food and also helps to push the food in oesophagus. Trachea and oesophagus opens into pharynx.
When food pass through oesophagus then contraction and relaxation occur this movement is known as peristaltic movement of food.
Oesophagus leads to a j shaped bag like structure called stomach. Stomach consists of cardic, pyloric and fundus regions.
Pyloric region opens into first part of small intestine called duodenum.
Small intestine consists of duodenum, jejunum, and ileum. Ileum opens into large intestine. Which further consists of colon, rectum and caecum.
Colon consists of ascending colon, descending colon and transverse colon. And descending colon opens into rectum and rectum into anus.
Hope it helps.