Question: what is the average venous blood pressure?
Answer: In a healthy person lying down, the pressure in the venous capillaries is about 20 mmHg; it falls to about 8 – 12 mmHg in the groin, measures around 3 – 5 (mm/Hg) in the abdominal cavity (intra-abdominal), and only 2 mmHg in the right atrium. These pressures are adequate for the return transport of the blood.