Page 617 - Atlas of Histology with Functional Correlations

C. peristalsis in the wall of the digestive tract.

D. contraction of the actin filaments in the individual cells of the villi.

E. smooth muscle fiber contraction from the muscularis mucosae that
extend into villi.

ANSWERS

1. Correct answer: B. Lamina propria of the villi. Each villus contains tiny,
blind-ending channels, lacteals, that transport the fatty acids out of the
lacteals into larger lymph vessels.

2. Correct answer: D. Absorb water and electrolytes from undigested
material. This action hardens the ingested material. There are no other
digestive functions in the colon.

3. Correct answer: C. Deep intestinal glands and predominance of goblet

cells. The goblet cells provide the necessary lubricant for moving the
hardened fecal material through the tube.

4. Correct answer: A. Three longitudinal muscle strips called taeniae coli.
The prominent outer longitudinal muscle layer is condensed into three
prominent strips, the taeniae coli.

5. Correct answer: E. Smooth muscle fiber contraction from the muscularis

mucosae that extend into villi. The movement of the villi and their
contractions increases their contact with digested material and moves the
fatty acids from the lacteals of the villi into larger lymph vessels.

ADDITIONAL HISTOLOGIC IMAGES

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