Medicine Which of the following statements concerning the circulatory system is true? A Occlusion of a functional end aery does not result in cell death B Veins generally have thicker walls than aeries C All veins have valves D Blood in a poal vein passes from one capillary bed to another 💡 Explanation Which of the following statements concerning the circulatory system is true? ✓ Correct Answer: D. Blood in a poal vein passes from one capillary bed to another