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.
Over 90% of charter school students in Illinois are served in Chicago. As of the 2014-15 school year, charter students made up 14% of the district overall, 23% of high school students, and 11% of elementary students. Other charter school students reside in cities across the state, with the second largest charter student population in the city of Rockford.