The first method is basically it will increase the rate at which the bone absorbs calcium. It will decrease the rate of activity of osteoclasts, which are the cells in the bone that basically resorb the bone and release calcium into our blood. So it will decrease their activity, but it will increase the activity of osteoblasts, which are those cells in the bone that build the matrix of the bone and absorb the calcium from our blood. So by increasing the activity of osteoblast and decreasing the activity of osteoclast inside the bone, the bone basically absorbs the calcium from our blood, thereby decreasing the calcium concentration in our blood. Now, the second method by which our calciton basically decreases the calcium concentration inside our blood is by increasing the rate at which our kidneys actually excrete this calcium into our outside environment. So it will cause more calcium to be excreted by the kidneys.