Imagine that you are a drop of blood. What path would you follow through a human's body as you travel from the left little toe, through the heart, and into the right big toe?

a. Heart

b. pulmonary artery

c. lungs

d. pulmonary vein

e. heart

f. aorta

g. arteries

h. big toe.

Explanation:

First I ( drop of blood) will go from the heart to the lungs through pulmonary artery in order to purification from carbondioxide and loaded oxygen. After that, I return to the heart through pulmonary vein and the heart pump this blood to the aorta which is a big blood vessel that branched into small arteries that reaches to every cell of the body and through these arteries I reach the big toe of the foot.

oxygen = 21% of the atmosphere

nitrogen = 78%

carbon dioxide = 0.1%

argon =0.934%