By the orb of the moon, the pulmonary venous conduit is meant. So when it is said that the Ganga overfloods the orb of the moon emerging from the foot of Visnu, it means the flow of oxygenated blood through the pulmonary venous conduit. The origin of the Ganga, standing for the origin of the entire circulatory flow, is (rightly) taken to be the flow of oxygen emanating from the alveoli (the "feet dust" of Visnu) mixing with the "water" in the capillary networks.
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