Although Often Drawn Symmetrically,the Wall of the Right Ventricle Is

Although often drawn symmetrically,the wall of the right ventricle is actually much thinner than that of the left and is able to generate only about one-quarter of the pressure.Why might this still be physiologically acceptable?

A) The lung is a single organ;systemic circulation requires higher pressures because the blood travels through several organs in sequence,with small drops in pressure in each.
B) The resistance to blood flow in the lung is much less than in the body's other organs.
C) The lungs are at the approximate level of the heart,so gravity is not a factor in pulmonary circulation.
D) The narrow capillaries where most friction is generated are absent in the lung.