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.
Midnight is considered 12:00:00 AM and 00:00:00 on the 24-hour time clock. Noon is considered 12:00:00 PM and 12:00:00 on the 24-hour time clock. The easiest way to rationalize this is that 12:00, 12:01, 12:02 are the first minutes of the day and consecutive so they are all AM. The last minute and second of the day is 11:59:59 PM after which it becomes AM.