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.
Say, if it's defined according to sunset and sunrise, the exact time of evening and morning would change everyday. You may check your local observatory service for the time. morning 12am afternoon 12pm evening 6pm night time is generally considered to be between 9pm & 12am.