Nostrils
Either of two openings in the nose.
Nostrils are openings in the nose that allow air to flow in and out of the respiratory system. They are lined with a mucous membrane and contain tiny hairs called cilia, which help filter out particles and debris from the air. Nostrils also have a sensory function, as they contain olfactory receptors that allow us to detect and distinguish different scents.
The left and right nostrils are separated by a thin wall of cartilage called the nasal septum. The nostrils also lead into the nasal cavity, where the air is further filtered, warmed, and humidified before it reaches the lungs.
Nostrils play an important role in breathing and also have other functions such as protecting the lungs from harmful particles and providing a sense of smell. If a person has trouble breathing through their nostrils, it could be due to conditions such as allergies, a deviated septum, or sinus infections and should be evaluated by a medical professional.
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