title: Basic and clinical concepts related to vitamin D metabolism and action (first of two parts).
mesh_terms: D015090:25-Hydroxyvitamin D3 1-alpha-Hydroxylase / Q000378:metabolism; D000818:Animals; D001842:Bone and Bones / Q000378:metabolism; D002116:Calcitonin / Q000502:physiology; D002118:Calcium / Q000378:metabolism*; D004100:Dihydroxycholecalciferols / Q000378:metabolism; D006801:Humans; D007408:Intestinal Absorption; D007668:Kidney / Q000378:metabolism; D008954:Models, Biological; D010280:Parathyroid Glands / Q000502:physiology; D010281:Parathyroid Hormone / Q000502:physiology; D010710:Phosphates / Q000378:metabolism; D011485:Protein Binding; D012333:RNA, Messenger / Q000096:biosynthesis; D014807:Vitamin D / Q000378:metabolism* / Q000502:physiology*
chemical_list: D004100:Dihydroxycholecalciferols; D010281:Parathyroid Hormone; D010710:Phosphates; D012333:RNA, Messenger; D014807:Vitamin D; D002116:Calcitonin; D015090:25-Hydroxyvitamin D3 1-alpha-Hydroxylase; D002118:Calcium