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.
Often the start of morning is extended before dawn, this time is considered the small hours (wee small hours) of the morning, so it can come to mean midnight to midday (in cultures using the 12-hour clock, these hours are ante meridiem, A.M., a.m., or am). Morning precedes midday, afternoon, and night in a day.