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.
For some, evening begins just before the sun begins to set, which is between 6:00 p.m. and 7:00 p.m. Still, for others, evening does not officially begin until sunset. In such places, 5:00 p.m. is still considered late afternoon.