The blood pressure in the inferior and superior venae cavae is essentially zero.

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The inferior and superior venae cavae are large veins that return deoxygenated blood to the heart. The blood pressure in these veins is very low, close to zero, due to the low resistance to flow of blood through them. The blood pressure increases as the blood flows from the right atrium through the tricuspid valve into the right ventricle and then into the pulmonary arteries.

The Blood Pressure in the Inferior and Superior Venae Cavae