1 Secretion of erythropoietin, which regulates red blood cell production in the bone marrow. 2  Secretion of renin, which is a key part of the reninâangiotensinâaldosterone system. 3  Secretion of the active form of vitamin D (calcitriol) and prostaglandins.
A: A charter school is a public school that is organized and operated according to the terms of the. charter, or contract. A charter school cannot have admissions criteria or charge tuition. A private school is not subject to state school laws, local board of education policies, or State Board of Education rules.
Charter schools are also public schools, and they are open to all children in California regardless of which school district they live in, although some charter schools give preference to children who live in the city where the school is located.