The heart is the major organ of the circulatory system. Which part of the body is responsible for delivering de-oxygenated blood to the heart?
arteries capillaries valves veins
Question: The heart is the major organ of the circulatory system. Which part of the body is responsible for delivering de-oxygenated blood to the heart?
A. arteries
B. capillaries
C. valves
D. veins
Answer: