Metabolism increases and more heat is released 6. B. Parathyroid Hormone and Calcium Ion Regulation 1. PTH recruits osteoclasts a. specialized cells that dissolve bone C. Action on PTH on the Kidneys 1. PTH increases formation of the active form of Vitamin D a. Vitamin D in the diet is inactive. It requires sunlight to produce the active form.
Vitamin D has a structure similar to steroid hormones and a receptor like steroid hormones.
E. Homeostatic Control of Ca in the Bloodstream 1. Vitamin D b. Increases Ca resorption at the kidney. Increase Ca removal from the bone 2. Aldosterone a. regulates Na levels in body by increasing Na retention in kidney 3. Functions of the Glucocorticoids a. Cortisol is most important b.