Now let's move on to our second organ, the heart. So the heart is basically an organ that consists of our cardiac muscle cells, also known as cardiac MIT. Now, special types of cardiac MIT located in the atria region of our heart, in the upper chambers of the heart, basically are responsible for releasing an important type of peptide hormone known as the atrial natriuretic peptide or amp. And what this hormone basically does is it dilates our blood vessels. So this is a vasodilator, that basically means it increases the thickness of our blood vessels and that decreases our blood pressure. And what it also does is it decreases the amount of blood volume found inside our blood and that also decreases our blood pressure.