Is the nasal cycle real? How important is it?
Challenges in Rhinology, Springer International Publishing Ag, ss.1-8, 2020
- Yayın Türü: Kitapta Bölüm / Araştırma Kitabı
- Basım Tarihi: 2020
- Doi Numarası: 10.1007/978-3-030-50899-9_1
- Yayınevi: Springer International Publishing Ag
- Sayfa Sayıları: ss.1-8
- Anahtar Kelimeler: Cilia, Nasal cycle, Nasopulmonary reflex, Physiological role, Upper airway
- Sağlık Bilimleri Üniversitesi Adresli: Evet
Özet
The nose plays an essential physiological role in how the upper airway functions, by heating and adding moisture to the inhaled air. Adults are thought to breathe in up to 10,000 L of air in any 24-h period. The lumen of the nose is the first point at which particles inhaled from the environment are trapped. The nasal hairs trap the biggest particles. The resistance to airflow of the airway as a whole is influenced by resistance offered by the nose; indeed, almost half the resistance in adults comes from the nasal cavity. The mucosal surfaces of the nose exchange heat so as to preserve the temperature of the air in the nose at between 31 and 37 °C. A further key role played by the nose is the addition of moisture to inhaled air. The mucosa is richly vascularised, and air is already at 95% relative humidity when it reaches the nasopharynx. Mucociliary flow depends on nasal secretions and functioning cilia, and this then contributes to the immune functions of the nose. Additionally, several reflexes of neurovascular type affect nasal function. Pressure applied to the lateral nasal wall on one side produces pulmonary congestion ipsilaterally via the nasopulmonary reflex, for example. In this chapter, nasal cycle is presented.