And more specifically, inhalation, we bring in oxygen and exhalation we expel, we remove the carbon dioxide that is produced inside our cells as a result of a byproduct of, let's say, cellular respiration, which once again, is not the same thing as respiration breathing that we're focusing on in this lecture. So let's begin by describing how inhalation is carried out by the lungs. So let's take a look at the following diagram. Now, in this diagram, we have our respiratory system. We have the windpipe, also known as the trachea, which by furcates at the bottom, it breaks down, it splits into the right bronchi and the left bronchi. And these bronchi connect to the right and our left lung.