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.
In the United States, afternoon is generally the time between noon and 5:00 p.m., and evening is considered anything after 5:00 p.m. There is no set allocation for afternoon and evening, however.
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.