Systemic venous blood that is oxygen-poor but contains the lowest concentration of nitrogenous wastes occurs in the
A. renal veins.
B. hepatic portal vein.
C. pulmonary veins.
D. umbilical veins of the fetus.
Answer:A
Systemic venous blood that is oxygen-poor but contains the lowest concentration of nitrogenous wastes occurs in the
A. renal veins. B. hepatic portal vein. C. pulmonary veins. D. umbilical veins of the fetus.