step 5: the blood then goes through the of the to the it leaves the heart through the then the blood travels through the releasing to the cells for and absorbs the gas exchange occurring here between the oxygen and carbon dioxide molecules occurs in the of the organs. the blood then goes back to the side of the through the veins and will go through the again.

(in this step is where you can describe where your blood cell goes – whether it goes to the leg, arm, etc. – you can be creative.)