| A | B |
|---|
| Bones store | 99% of calcium |
| 9-11 mg/100ml of blood | calcium levels in body |
| breathing may cease if | Ca+ too low in blood |
| heart may stop | if Ca+ too high in blood |
| enzymes need as a cofactor | Ca+ ions |
| parathyroid hormone | released if levels Ca+ are low |
| osteoclasts increase bone resorption | if PTH is released |
| calcitriol | active form of vitamin D |
| thyroid gland releases | calcitonin |
| calcitonin | inhibits osteoclasts activity |
| calcitonin promotes | bone formation |
| calcitonin released when | Ca+ levels are too high |
| fracture hematoma | blood clot around fractured bone |
| loss of blood causes | bone cells to die |
| procallus | hematoma forms granulation tissue |
| fibroblasts invade | procallus |
| chondroblasts develop in | avascular areas |
| fibrocartilage | develop in avascular areas of broken bone |
| fibrocartilaginous callus | when fibrocartilage forms through fracture |
| osteoblasts produce spongy bone | in vascularized areas |
| fibrocartilage converted to spongy bone | in bony callus |
| compact bone | replaces spongy bone in fracture |
| thickened area | found around fracture area |
| lack of estrogen | causes bone loss |
| resorption outpaces bone formation | osteoporosis |
