All exit accesses and exits in a building are required to be identified with ____.

In the stomach, chief cells secrete pepsinogen, which becomes ________ in the presence of acid. 

Fill in the blank(s) with the appropriate word(s).

In which examination position does the patient lie on his back with his knees drawn up and his feet flat on the table? 

A. Prone B. Dorsal recumbent C. Fowler's D. Sims' E. Proctologic