18. Which blood vessel carries oxygenated blood back to the heart from the body?

Question

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

Answer 1

b) Vein

c) Cardiac cycle