Both sides of the nasal septum contain air passages that make up the nasal cavity. Turbinates, which are three conchae, divide the cavity in half along its length. The turbinates are incredibly well-supplied with blood and have an abundance of glands. The choanae open into the nasopharynx and are near the back of the nasal cavity. The nasal cavity is essential for breathing, smelling, cooling, and protecting immunity. Before exchanging oxygen in the lungs, the vast, humidified surface area of the nasal cavity is perfect for regulating the inhaled air quality. Mainly during inflammation, nasal mucus shields the epithelium from outside invaders. The olfactory nerve contains specific nerve terminals that give humans the unique sensory capacity to smell. Nasal congestion and decongestion naturally alternate between the nasal cavity’s left and right sides due to the nasal cycle.