bronchiole
Quick Summary
Bronchioles are small airways within the lungs that branch off from the bronchi. They are part of the lower respiratory system, which also includes the larynx, trachea, and bronchi. The bronchioles are crucial for conducting air to the gas-exchanging areas of the lungs.
Key characteristics of bronchioles:
* Size: They range in diameter from three millimeters down to less than one millimeter.
* Structure: Unlike larger bronchi, bronchioles lack cartilage and seromucous glands. Their walls contain smooth muscle that can constrict the airway.
* Epithelium: They are lined with simple cuboidal epithelium, featuring ciliated cells and Clara cells, which produce secretions.
* Function: Bronchioles play a role in regulating airflow. Spasms in their smooth muscle can lead to conditions like asthma.12
Bronchioles are distinct from bronchi, which are larger airways that branch directly from the trachea and are supported by cartilage rings or plates.12
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lung…in diameter are known as bronchioles, which lead to minute air sacs called alveoli (see pulmonary alveolus), where the actual gas molecules of oxygen and carbon dioxide are exchanged between the respiratory spaces and the blood capillaries.
Read More…in diameter are known as bronchioles, which lead to minute air sacs called alveoli (see pulmonary alveolus), where the actual gas molecules of oxygen and carbon dioxide are exchanged between the respiratory spaces and the blood capillaries.
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human respiratory systemStructural design of the airway tree…bronchi, the bronchi, and the bronchioles. Their function is to further warm, moisten, and clean the inspired air and distribute it to the gas-exchanging zone of the lung. They are lined by the typical respiratory epithelium with ciliated cells and numerous interspersed mucus-secreting goblet cells. Ciliated cells are present far…
Read More…bronchi, the bronchi, and the bronchioles. Their function is to further warm, moisten, and clean the inspired air and distribute it to the gas-exchanging zone of the lung. They are lined by the typical respiratory epithelium with ciliated cells and numerous interspersed mucus-secreting goblet cells. Ciliated cells are present far…
Read More