So it decreases the pressure needed to expand or inflate the alveoli when we actually inhale, when we breathe in, it also prevents the alveoli from actually collapsing onto themselves when we actually exhale. So overall, what the surfactant in the alveoli of the lungs does is it makes the process of breathing much more efficient and much more easy to carry out. Now the question is why and how does the surfactant actually carry out these two functions? Well, to answer this question, we have to begin by answering question number one and question number two, if we understand these two questions. And the answer to these two questions will have no problem actually understanding how the surfactant in the alveoli actually works. So let's begin with question number one.