The Digestive system

 

·       Structure of digestive system:

 

 

 

 

The alimentary canal           its asociates

 

 

1-Mouth                                1-salivary gland

2-Pharynx                             2-the liver

3-Oesophagus                       3-the pancreas

4-Stomach

5-Small intestine

6-Large intestine

7-anus

*Digestion :breaking down complicated food substances to simple water soluble substances.

*Absorption:The moving of digested food from the small intestine to the blood.

·       The digestion and absorption of food is completed in the small intestine.

·       People infected by Anklystoma  suffer from anaemia .

·      Keeping digestive system healthy:

1-keep your hands  clean.

2-keep your food clean.

3-brush your  teeth after eating .

4-food should contain vegetables.

5-do fill your stomach .

** Functions:

1-salivary glands :produce saliva in mouth that converts starch to simple sugar.

2-liver:It produces the bile that helps in digestion of fats.

3-The bile:It breaks down fat into small particles which dissolve in water .

4-Pancreas :It produce enzymes to help in food digestion .

5-Large intestine : It stores the undigested food till it is eliminated from the body through the anus.

6-Oesophagus : It permits the food to pass from the pharynx to stomach .

7-Pharynx:it permits food to pass from the mouth to oesophagus.

8-Digestive system: digestion and absorption of food .

9-Mouth:Chewing food by teeth .and the starch changed into simple sugar by saliva .

10-Small intestine:

1-The food is completely digisted in it.

2-It absorbs the digested food  and passes it into  the blood stream.

11-Stomach:produce enzymes to  help in food digestion.

** The stools of infected person by Anklystoma is mixed with blood because these worms feed on the intestine membrane.

·      Symptoms of anklystoma are:

1-Bleeding and bloody stools.

2-People infected by it suffer from anaemia..

Questions

1-Complete:

1-The …………. Is a part of alimentary canal.

2-Bile helps in digestion of ………………….

3-The act of transferring digested food into blood is called………………………………

4-Bile is secreted by ……………………….

5-Digestion of food is completed in …………...

6-Food is absorbed in ……………………

7-Changing the insoluble food substance into soluble substances is called ……………………

8-Digestion and absorption of food is completed in the ……………………………….

9-Salivary glands secrete saliva in the ………

10-Pancreas secretes some juices to pour the

……………..

12-The blood carries the digested food from ………… to ……………….

13-bile is a …………….. produced by ………...

14-Digested food is absorbed in the …………..

15-bile is produced by ………… and helps to ……….

16-The alimentary canal consists of ………….

,………….,…………,……………,…………….

,……………and ……………..

17-Liver produces   ………….. which digests

………….

18-Anklestoma worms live in the ……………..

causing ……………..

19-Starch is changed into sugar in mouth by …………….

20-Saliva is produced in the ………..by ………

21-The gland asociated with the alimentary canal are: ………..,………….and……………..

22-The tube that joins the mouth with stomach is called ………….

**Mention one function for the following:

1-Liver:

2-Pancreas:

3-Bile:

4-small intestine:

5-stomach:

6-salivary glands:

7-Saliva:

** What is the meant by:

 1-Digestion:

 

 

2-Absorption:

 

 

**Give reasons for each :

1-   You feel a sweety taste when you chew a pice of white bread.

- Because saliva changes the starch into simple sugar.

 

الدرس الأول

الصفحة الرئيسية