Which factor mainly determines the amount of oxygen bounded to hemoglobin pH PCO_2 PO_2 Erythropoietin release is stimulated by: acidosis of the blood reduced oxygen in the vena cava reduced blood flow to the marrow reduced oxygen in the renal artery the peripheral chemoreceptors are located in the: brain spinal cord ling none of the above The pulmonary capillaries have a much blood pressure than systemic capillaries. Prevent fluid imbalance, the lung: