The hydrostatic pressure of blood against the blood vessel w

The hydrostatic pressure of blood against the blood vessel walls is lowest in the aorta capillaries coronary arteries vena cava

Solution

The answer is \"vena cava\"

Pressure within the thoracic (inferior) vena cava near the right atrium is very close to zero, and fluctuates from a few mmHg negative to positive with respiration.

The venae cavae are large veins (venous trunks) that return deoxygenated blood from the body into the heart. In humans they are called the superior vena cava and the inferior vena cava, and both empty into the right atrium. They are located slightly off-center, toward the right side of the body.

The inferior vena cava travels up alongside the abdominal aorta with blood from the lower part of the body. It is the largest vein in the human body.

The superior vena cava is above the heart, and forms from a convergence of the left and right brachiocephalic veins, which contain blood from the head and the arms.