næsekanalerne

Næsekanalerne, also known as nasal passages, are the two passageways that make up the internal nose. They begin at the nostrils and extend backward to the nasopharynx, the upper part of the throat. These channels are crucial for respiration and play a significant role in filtering, warming, and humidifying inhaled air before it reaches the lungs. The walls of the næsekanalerne are lined with a mucous membrane that contains tiny hair-like structures called cilia.

The mucous membrane secretes mucus, which traps dust, pollen, bacteria, and other airborne particles. The cilia then beat rhythmically, moving the mucus and trapped debris towards the back of the throat, where it can be swallowed or expelled. This process of filtration is a vital defense mechanism against respiratory infections. Furthermore, the rich blood supply within the nasal lining helps to warm incoming cold air and humidify dry air, preventing damage to the delicate tissues of the lungs.

Within the næsekanalerne are three bony projections called turbinates, or conchae. These structures increase the surface area of the nasal lining, allowing for more efficient warming, humidifying, and filtering of air. The turbulence created by air flowing over the turbinates also prolongs the contact time between the air and the mucous membrane. The næsekanalerne are also important for the sense of smell, as olfactory receptors are located in the upper part of the nasal cavity.