And so, when we increase the amount of parathyroid hormone PTH in our blood, that basically does three things. It increases bone resorption, so it increases the rate of osteoclast and decreases the rate of osteoblasts. It increases the absorption of our kidneys, as well as increases the absorption of calcium in our intestines. And together, this basically increases the amount of calcium that is found inside our blood. Now, over time, as the concentration of calcium in our blood increases, this will create a negative feedback loop and it will cause our parathyroid gland to basically decrease in its release of PTH. And so, over time, this will stabilize and maintain the concentration of calcium in our blood serum, in our blood plasma.