List the correct order of the terms below that describe the travel of an oxygen molecule in the blood from the heart to a muscle cell.
a. heart, arteries, arterioles, capillaries, interstitial fluid
b. capillaries, venules, veins, heart
c. heart, capillaries, venules, veins
d. heart, capillaries, arterioles, arteries, interstitial fluid
e. heart, capillaries, arterioles, arteries, alveoli



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