Page 580 - Atlas of Histology with Functional Correlations

E. gastrin.

4. What role do the surface epithelium cells perform during the digestive

process?

A. They add secretions to the gastric juices produced by the gastric
glands.

B. They secrete mucus for the stomach lining to protect it against
corrosive gastric juices.

C. They secrete additional hydrochloric acid to the gastric juices.

D. They produce pepsinogen.

E. They produce gastric hormones to assist digestive processes.

5. What is found in the lamina propria of the stomach?

A. Connective tissue and gastric glands

B. Different nerve plexuses

C. Longitudinal and all three circular smooth muscle layers

D. Adventitia

E. Large blood vessels and nerves

ANSWERS

1. Correct Answer: C. Acidic environment containing hydrochloric acid.
Once pepsinogen reaches the acidity of the stomach, it is converted to the
proteolytic enzyme pepsin.

2. Correct Answer: D. It is necessary for absorption of vitamin B12 from the

small intestine. This factor is produced by the parietal cells and plays an
important role in erythropoiesis in the bone marrow.

3. Correct Answer: B. Pepsinogen. This is an inactive precursor of pepsin that
is formed after pepsinogen reaches the acidic environment of the stomach.

4. Correct Answer: B. They secrete mucus for the stomach lining to protect it

against corrosive gastric juices. The surface cells produce large amounts of
mucus that cover the luminal surface of the stomach.

5. Correct Answer: A. Connective tissue and gastric glands. The connective
tissue is squeezed by the gastric glands into strips between the glands.

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