
Secondary bronchi
Secondary bronchi are intrapulmonary passages that are part of the conducting portion of the respiratory system. As a secondary bronchus branches from a primary, it becomes smaller in diameter and its wall thins. Cartilage plates and mixed glands remain, distinguishing these passages from bronchioles. Pulmonary arteries accompany secondary bronchi. 40x

Secondary bronchi
Secondary bronchi are intrapulmonary passages that are part of the conducting portion of the respiratory system. As a secondary bronchus branches from a primary, it becomes smaller in diameter and its wall thins. Cartilage plates and mixed glands remain, distinguishing these passages from bronchioles. Pulmonary arteries accompany secondary bronchi. 40x

Cartilage plates
Secondary bronchi are intrapulmonary passages that are part of the conducting portion of the respiratory system. As a secondary bronchus branches from a primary, it becomes smaller in diameter and its wall thins. Cartilage plates and mixed glands remain, distinguishing these passages from bronchioles. Pulmonary arteries accompany secondary bronchi. 40x

Mixed glands
Secondary bronchi are intrapulmonary passages that are part of the conducting portion of the respiratory system. As a secondary bronchus branches from a primary, it becomes smaller in diameter and its wall thins. Cartilage plates and mixed glands remain, distinguishing these passages from bronchioles. Pulmonary arteries accompany secondary bronchi. 40x

Pulmonary vessels
Secondary bronchi are intrapulmonary passages that are part of the conducting portion of the respiratory system. As a secondary bronchus branches from a primary, it becomes smaller in diameter and its wall thins. Cartilage plates and mixed glands remain, distinguishing these passages from bronchioles. Pulmonary arteries accompany secondary bronchi. 40x

Bronchioles
Secondary bronchi are intrapulmonary passages that are part of the conducting portion of the respiratory system. As a secondary bronchus branches from a primary, it becomes smaller in diameter and its wall thins. Cartilage plates and mixed glands remain, distinguishing these passages from bronchioles. Pulmonary arteries accompany secondary bronchi. 40x

Alveoli
Secondary bronchi are intrapulmonary passages that are part of the conducting portion of the respiratory system. As a secondary bronchus branches from a primary, it becomes smaller in diameter and its wall thins. Cartilage plates and mixed glands remain, distinguishing these passages from bronchioles. Pulmonary arteries accompany secondary bronchi. 40x

Image source >
This image was taken from a slide in the University of Michigan slide collection.