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Which rodents pulmonary vein has striated muscle fibers within

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Which rodent's pulmonary vein has striated muscle fibers within its walls that are contiguous with those in the heart?

It's rats that you're thinking of. They have some node like cells in the myocardial layer of the pulmonary vein near the heart. There are muscle fibers (smooth, not skeletal) that run continuous and help to regulate blood pressures.

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