Now, what saliva also does is it actually lubricates our bolus, our food and that allows the movement of the bolus along Aristophagus with a minimal amount of friction and that ensures that the movement of arabolis along the esophagus doesn't actually hurt, it is not actually painful. Now let's move on to our pharynx. The pharynx is basically the passageway that connects our oral as well as nasal cavity to our windpipe as well as to our esophagus. Now, because we have this connection, this intersection between the windpipe and our esophagus, we basically have a flap of cartilage known as epiglottis that separates the windpipe from Aristophagus. So what the windpipe does is it allows the movement of air from the mouth from the nose or mouth to our lungs while what our esophagus allows us to do is it allows us to actually move the food from the mouth to our stomach. Now what this epiglottis does is when we initiate the process of swallowing, when we begin swallowing our food, our epiglottis basically closes our windpipe and that allows our food bowls to actually move along the pharynx and right into our esophagus.