<Tr> <Th> Prolactin </Th> <Td> PRL </Td> <Td> Decidual cells </Td> <Td> milk production in mammary glands </Td> </Tr> <Tr> <Th> Relaxin </Th> <Td> </Td> <Td> Decidual cells </Td> <Td> Unclear in humans and animals </Td> </Tr> <Ul> <Li> </Li> <Li> </Li> </Ul> <Table> <Tr> <Th> Secreted hormone </Th> <Th> Abbreviation </Th> <Th> From cells </Th> <Th> Effect </Th> </Tr> <Tr> <Th> Parathyroid hormone </Th> <Td> PTH </Td> <Td> Parathyroid chief cell </Td> <Td> Calcium: <Ul> <Li> Stimulates Ca release from bone, thereby increasing blood Ca </Li> <Li> Stimulates osteoclasts, thus breaking down bone </Li> <Li> Stimulates Ca reabsorption in kidney </Li> <Li> Stimulates activated vitamin D production in kidney </Li> </Ul> <P> Phosphate: </P> <Ul> <Li> Stimulates PO release from bones, thereby increasing blood PO . </Li> <Li> Inhibits PO reabsorption in kidney, so more PO is excreted </Li> <Li> Overall, small net drop in serum PO . </Li> </Ul> </Td> </Tr> </Table>

Which gland or glands in the body are also part of the central nervous system