Circulation: o2 from atmosphere to foot

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Exits through arteries going away from the heart to the rest of the body, in case: a foot.

RBC enters left atrium, through mitral valve, left ventricle, aortic valve and aorta

RBC travels to heart through capillaries, venules and veins

O2 attatches to RBC

Circulation: o2 from atmosphere to foot

Reaches alveoli

Continues to bronchioles

continues into secondary bronchi

Moves on into primary bronchi

Travels down esophagus and trachea

Oxygen gets inhaled