Human Digestive System
Basic Questions:
1. Canines are used for _________________digestion.
2. The fingerlike projections in the small intestines are the ____________
3. The wavelike motion that pushes food through the intestines is called _________________
4. The chemical breakdown of food is performed by _______________________________(3 items)
5. Bile is produced by the _________________________________
6. Bile is stored in the _____________________________________
7. Broken down nutrients are absorbed in the _______________________
8. Water and some vitamins are absorbed in the___________________________.
9. The greatest amount of digestion occurs in the _____________________________
True/False questions
10. Mechanical digestion increases the surface area of food being digested.
11. Fats and Protein have the same amount of calories per gram.
12. Ptyalin is secreted by the cells in the stomach.
13. Blood vessels are found in the villi of the stomach.
14. Villi increase the surface area, leading to an increase in the absorption of
food.
Multiple Choice
15. Absorption of nutrients into the bloodstream begins in the
a. Mouth
b. Stomach
c. Small Intestine
d. Large Intestine
16. The digestion of carbohydrates begins in the
a. Mouth
b. Esophagus
c. Stomach
d. Small Intestines
17. The digestion of proteins begins in the
a. Mouth
b. Esophagus
c. Stomach
d. Small Intestines
18. The digestion of fats and oils begins in the
a. Mouth
b. Esophagus
c. Stomach
d. Small Intestines
19. Gastric juices refers to the juices of the
a. Mouth
b. Esophagus
c. Stomach
d. Small Intestines
20. Bacteria are helpful in breaking down food in the
a. Mouth
b. Stomach
c. Small Intestine
d. Large Intestines
21. What organs perform mechanical digestion?
a. Small and Large Intestine
b. Mouth and Stomach
c. Mouth and Small Intestine
d. Stomach and Small Intestine
22. Peristalsis does not occur in the…
a. Mouth
b. Esophagus
c. Small Intestines
d. Large Intestines
23. Which of the following organic molecules is used for chemical digestion?
a. Carbohydrates
b. Proteins (remember that enzymes are a type of protein)
c. Fats and Oils
d. Nucleic Acids
24. Which of the following is not a gastric juice?
a. Hydrochloric Acid
b. Pepsin
c. Ptyalin
d. Mucus
25. The gall bladder and pancreas inject substances into the ________________________
26. List in order the organs that food passes through.
 Mouth
 Pharynx

Esophagus

Stomach

Small Intestines: which includes the duodenum (first section)

Large Intestines: which includes the rectum (last section)

Anus
27. Food does not pass through all the organs of the digestive system. What organs do not come in contact with
food, but will inject substances necessary for digestion?
28. Would the breakdown of food without mechanical digestion be more or less efficient? Why?
29. Why are the small intestines so long?
 .