Which Statement About Cells and Secretions of the Human Stomach

Multiple Choice

Which statement about cells and secretions of the human stomach is true?

A) Chief cells secrete pepsin as an active enzyme.
B) Newly activated pepsin converts pepsinogen to pepsin in a positive feedback process called autocatalysis.
C) Mucus secreted by cells lining the gastric pits lowers the pH of the stomach contents.
D) Low pH initiates the conversion from pepsin to pepsinogen.
E) Parietal cells secrete mucus.