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. It basically inhibits the activity of certain cells in our kidneys that absorb that calcium. And finally, it causes our intestines to basically absorb less calcium. And that means the calcium will eventually be excreted into the outside environment.