Respiratory System

Question 6 - Single Best Answer

Identify the structure:

D) pulmonary vein

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A pulmonary vein would have a simple squamous epithelium (endothelium), there would be a large lumen:smooth muscle ratio, and there might be red blood cells might be present in the lumen. Note that a pulmonary vein typically appears by itself in the lung tissue while a pulmonary artery is usually paired with a bronchiole.