181.  When intestinal chyme is highly concentrated,  
A.  water moves by osmosis into the lumen of the small intestine.
B.  water moves by osmosis from the intestinal lumen into the blood.
C.  water moves by endocytosis from intestinal lumen into interstitial spaces.
D.  water moves by exocytosis from interstitial spaces into the stomach.
E.  water does not move.

182.  How are ions such as sodium, potassium, calcium, magnesium, and phosphate transported from the intestinal lumen?  
A.  passive transport
B.  osmosis
C.  diffusion
D.  active transport

183.  Most of the water that enters that digestive tract is removed by the body in urine.  
FALSE

184.  Which of the following are effects of aging on the digestive system?  
A.  blood supply decreases
B.  more likely to develop ulcerations and cancers
C.  enamel on teeth becomes thinner
D.  blood supply decreases and more likely to develop ulcerations and cancers.
E.  blood supply decreases, more likely to develop ulcerations and cancers and enamel on teeth becomes thinner.

185. What does “A” represent on the diagram? 
A. small intestine
B. large intestine
C. esophagus
D. stomach
E. liver

186. What does “B” represent on the diagram? 
A. small intestine
B. large intestine
C. esophagus
D. stomach
E. liver

187. What does “C” represent on the diagram? 
A. small intestine
B. large intestine
C. esophagus
D. stomach
E. liver

188. What does “D” represent on the diagram? 
A. small intestine
B. large intestine
C. esophagus
D. stomach
E. liver

189. What does “E” represent on the diagram? 
A. small intestine
B. large intestine
C. esophagus
D. stomach
E. liver

190.  The diagram illustrates the anatomy of the stomach. What does “A” represent?  
A.  muscularis
B.  duodenum
C.  esophagus
D.  pyloric sphincter
E.  cardiac part