Name: 
 

Human Digestive System



Completion
Complete each sentence or statement.
 

1. 

The __________  __________ is the group of organs that work together to break down food so that it can be used by the body.
The following drawing illustrates the Human Digestive System.
human_digestive_sys_files/i0020000.jpg
 

 

2. 

Digestion begins as soon as food enters the ________.
 

 

3. 

The function of teeth in this digestive process is to:
 

 

4. 

The type of digestion performed by the teeth is referred to as ____________ digestion.
 

 

5. 

The purpose of saliva is to:
 

 

6. 

The type of digestion started by saliva is referred to as ___________ digestion.
 

 

7. 

The _____________ is a long tube that connects the mouth to the stomach.
 

 

8. 

The _________ is a muscular organ that continues physical digestion by squeezing its contents with muscular contractions.
 

 

9. 

_______ in the stomach produce _________ and ________ that further break food into nutrients.
 

 

10. 

After a few hours within the stomach, the food becomes a soupy mixture called _______.
 

 

11. 

The ______   ________ (a long, muscular tube) receives the chyme from the stomach to continue the digestive process.
 

 

12. 

Most _________ digestion takes place in the small intestine.
 

 

13. 

_______ are small fingerlike projections that line the inside of the small intestine.
 

 

14. 

The purpose of the villi is to:
 

 

15. 

Chemicals containing digestive enzymes and bicarbonate flow from the ___________.
 

 

16. 

The purpose of the bicarbonate produced by the pancreas is to:
 

 

17. 

If the chyme was not neutralized by the bicarbonate then the acid would:
 

 

18. 

The ______ is another organ that helps with digestion.
 

 

19. 

The liver makes a liquid called ____ that is used to digest fat.
 

 

20. 

The liver has additional functions such as:
 

 

21. 

Bile produced by the liver is temporarily stored in the ____________.
 

 

22. 

The ______    _________ receives whatever cannot be absorbed from the chyme into the blood.
 

 

23. 

The large intestine ______, ________ and ________ material that cannot be digested.
 

 

24. 

Most of the remaining water is reabsorbed, changing the soupy mixture into a solid mass called _______.
 

 

25. 

The last section of the large intestine is called the _________.
 

 

26. 

Additional waste products must be removed from the blood through ___________.
 

 

27. 

___________ is the process through which toxic chemicals, excess water, salts, and carbon dioxide are removed from the body.
 

 

28. 

Several different organs are involved in excretion. One is the ___________   ________ where blood carries waste materials to the lungs.
 

 

29. 

The _______ allow the waste materials in the blood to be removed, such as carbon dioxide and some water vapor
 

 

30. 

The _____ is also involved in excretion because water, salts, and other wastes are removed through the skin in sweat.
 

 

31. 

The __________ are important organs of excretion.
 

 

32. 

Blood carrying wastes from the body's cells passes through tiny filters in the kidneys, called ________.
 

 

33. 

The cleaned blood leaves each kidney and recirculates in the body. The yellow fluid that remains in the nephron is called _______.
 

 

34. 

Urine leave each kidney through a tube called a _______ and is stored in the urinary bladder.
 

 

35. 

Most chemical digestion takes place in the _______   __________.
 

 



 
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