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Pulmonary Capillary Bed (Physical Trapping)

Molecular classification: Microvasculature, Capillary Network

Overview

The pulmonary capillary bed is a dense network of microvessels in the lungs, primarily responsible for gas exchange between blood and alveolar air. Physical trapping in the pulmonary capillary bed refers to the mechanical retention or restriction of cells or particles—most notably leukocytes (white blood cells)—within these narrow vessels. This phenomenon can contribute both physiologically (filtering) and pathologically (injury risk).

Other names: Pulmonary MicrocirculationLung CapillariesAlveolar Capillary Bed

Biological functions

Gas exchange (O₂ uptake/CO₂ removal)Immune cell sequestrationMicrocirculatory regulation

Disease associations

Acute Respiratory Distress Syndrome (ARDS)SepsisAcute Lung InjuryIschemia

Safety considerations

Impaired perfusion (ischemia)Local tissue damage due to neutrophil entrapment

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