Chief cells ( stomuch) secreate pepsinogen , a inactivae enzyme. And in small intestine it converted into pepsin ,active form. Chief cell also present in parathyroid gland release pth harmone regulates level of calcium, magnesium, HPO4 ions in blood.
The dictionary definition of afternoon is simply the hours between noon and evening. In the United States, the typical workday ends at 5:00 p.m.
12 hour format cycles from 12:01 through 12:00 twice each day. 24 hour format cycles from 00:01 through 24:00 once each day similar to military time. Although it is incorrect, we follow common usage of Noon = 12:00 pm and Midnight = 12:00 am when employing the 12 hour clock and am/pm.