From what we know, the term used to describe the accumulation of blood in the limbs that occurs when venous pressure is not high enough to overcome the weight of the blood and drive it upward is venous pooling.
This is, as described in the question, the accumulation of blood in the limbs. This is often caused by the inability of the veins to keep blood moving towards the heart and is often an indicator of underlying pathology.
Therefore, we can confirm that the accumulation of blood in the limbs occurs when the veins are unable to maintain the blood flowing in the proper direction, and this is referred to as venous pooling.
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