b) Vein
c) Cardiac cycle
18. Which blood vessel carries oxygenated blood back to the heart from the body?
a) Artery
b) Vein
c) Capillary
d) Venule
19. The rhythmic contraction and relaxation of the heart is called:
a) Respiration
b) Circulation
c) Cardiac cycle
d) Atherosclerosis
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