A blood vessel which carries blood back to the heart is : (a) artery (b) vein (c) capillary (d) platelet
The veins take oxygen-poor blood back to the heart. Hence, the correct option is (b).
The blood vessel which carries oxygenated blood from the lungs to the heart is : (a) main artery (b) pulmonary artery (c) main vein (d) pulmonary vein
Veins and arteries carry blood. Which of these carry blood : (a) away from the heart ? (b) back to the heart ?