21) Most digestion occurs in the:

A) large intestine.

B) mouth.

C) stomach.

D) small intestine.

22) Most of the absorption of digested food takes place in the:

A) stomach.

B) esophagus.

C) large intestine.

D) small intestine.

23) Roughly how long is the small intestine?

A) 6 feet

B) 14 feet

C) 20 feet

D) 30 feet

24) What is the first part of the small intestine that receives food from the stomach?

A) duodenum

B) ileum

C) jejunum

D) cecum

25) How would blockage of the pancreatic duct affect the digestive system?

A) The food in the small intestine would be more basic (alkaline).

B) It would have little effect because liver enzymes would take over.

C) The small intestine would contain acidic, mostly undigested chyme.

D) The stomach would be unable to function.

26) Gallstones are a problem when they:

A) get stuck in the folds of the small intestine.

B) block the cystic duct or common bile duct.

C) break and release enzymes.

D) break and release cholesterol.

27) The main function of the gallbladder is to:

A) make bile.

B) make gallstones.

C) store and concentrate digestive enzymes.

D) store and concentrate bile.

28) Which organ is central to the body’s metabolism of nutrients?

A) the stomach

B) the kidneys

C) the liver

D) the small intestine

29) What is the main function of the colon?

A) to complete the digestion of lipids

B) to absorb water and vitamin K

C) to control nutrients it will send to the rest of the body

D) to digest and absorb carbohydrates

30) The appendix is attached to which portion of the large intestine?

A) the cecum

B) the colon

C) the rectum

D) the ileocecal valve