Destruction of lung parenchyma leads to a reduction in which vascular structures?

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Destruction of lung parenchyma compromises the tiny vessels that line the alveolar walls. The alveolar capillaries are embedded in and around the alveolar septa, so when parenchymal destruction occurs (as in emphysema), these delicate capillary networks are lost along with the supporting septal tissue. That means a smaller total capillary surface area for gas exchange and a reduced pulmonary capillary blood volume, which also explains the lowered diffusion capacity seen in such conditions. The larger airways and arteries aren’t the primary structures destroyed by parenchymal damage, so the most affected vascular component is the alveolar capillary bed.