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  Indian J Med Microbiol
 

Figure 1: Systematic regulation of Ca2+ homeostasis in human body. If the Ca2+ level is too low, parathyroid hormone is released from parathyroid glands. It then stimulates Ca2+ uptake from intestines, increases the rate of Ca2+ release from bone and the rate of Ca2+ reabsorption in the urinary system. If the Ca2+ level is too high, the opposite regulation will occur to control the blood Ca2+ level. Thus, the blood Ca2+ is strictly maintained between 1.1 and 1.2 mmol/L

Figure 1: Systematic regulation of Ca<sup>2+</sup> homeostasis in human body. If the Ca<sup>2+</sup> level is too low, parathyroid hormone is released from parathyroid glands. It then stimulates Ca<sup>2+</sup> uptake from intestines, increases the rate of Ca<sup>2+</sup> release from bone and the rate of Ca<sup>2+</sup> reabsorption in the urinary system. If the Ca<sup>2+</sup> level is too high, the opposite regulation will occur to control the blood Ca<sup>2+</sup> level. Thus, the blood Ca<sup>2+</sup> is strictly maintained between 1.1 and 1.2 mmol/L