So basically the A and P hormone is the opposite of aldosterone. So recall that aldosterone actually increases the amount of sodium that we take back into our blood. But what amp does, what the atrial natriure retic peptide hormone does is it basically increases the amount of sodium that we secrete into our urine and that decreases the amount of solute inside our blood and that ultimately increases the amount of water that leaves our blood system. So the atrial natriuretic peptide hormone released by the heart is responsible for controlling the blood pressure, for decreasing our blood pressure inside our body. So this is released when we have a very high blood pressure inside our blood vessels of the heart and of the body. Now let's move on to another organ, the third organ, the skin.