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 in Harlem include: Amber Charter School, grades Kâ5, 220 E. 106th St., in Community School District 4; school chartered by State Univ. of N.Y. (SUNY): Democracy Prep Charter School, grades 6â9, 207 W. 133rd St., in Community School District 5; school chartered by N.Y.C. Dep't of Educ.