And what will happen is that blood, the fluid, will move down its pressure gradient from the order and into the pulmonary trunk because now we have a higher pressure inside the order compared to our pulmonary trunk. And so our blood, the oxygenated blood, will travel from the order into the pulmonary trunk. And so we have a mixing of oxygenated and deoxygenated blood taking place within the pulmonary trunk. Now, what exactly does that mean? Well, because some of that blood from the systemic circulatory system moves back into the pulmonary trunk, less of the oxygen will actually reach the tissues of that individual. And as a result, that heart will need to pump harder and more to actually make sure that the tissues get enough oxygen.