MICROANATOMY

Detailed explanation-1: -The bronchi are the two large tubes that carry air from your windpipe to your lungs. You have a left and right main bronchus in each lung.

Detailed explanation-2: -Two lobar bronchi exist in the left lung, and three exist in the right lung. The lobar bronchi, in turn give rise to segmental or tertiary bronchi. The tertiary bronchi supply the bronchopulmonary segments.

Detailed explanation-3: -Bronchopulmonary segment There are 10 bronchopulmonary segments in the right lung (3 in the superior lobe, 2 in the middle lobe, 5 in the inferior lobe), and 8 segments in the left lung (4 in the upper lobe, 4 in the lower lobe).

Detailed explanation-4: -There are 300 million alveoli in the lungs, and these give approximately 140m surface area for the exchange of gases. The alveoli are responsible for the spongy nature of the lung. These alveoli are lined by flattened epithelial cells called pneumocytes with a single opening.