Our sense of smell works by taking in airborne particles through our nose, where they are broken down and dissolved in what is called the "olfactory epithelium." This explains why our sense of smell is affected when we have a stuffy nose - your nose becomes clogged and disrupts the ability for particles to reach your olfactory epithelium.
The nose is made up of two nostrils and a septum, or the wall of tissue that separates your nostrils or nasal cavity. Deeper in your head towards your skull, the septum is made up of thin bones, but towards the end of your nose, it is made of softer cartilage. Your nasal cavity connects to your palate, or the roof of your mouth.
Our nose not only serves as our main pathway for breathing, it makes the air we breath cleaner thanks to the mucus in our noses that help capture potential irritants such as dirt or pollen before they can reach our lungs.