30. What and how many are
the pulmonary veins?

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The pulmonary veins part of the
circulation. They are
that carry oxygen-rich () blood
from the to the heart. are
four pulmonary , two that drain
from the right and other two
drain the left . The pulmonary
veins into the left
bringing arterial blood the heart.
Although are veins they
arterial blood and venous blood.