- 5. What happens to blood when it is pumped into the thin-walled blood vessels of the lungs? A Blood fills the lungs and causes coughing. C. Platelets are exchanged for plasma. B. Carbon dioxide is replaced with oxygen. D. Nothing - the lungs are just a place blood goes through on its way back to the heart
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Blood is pumped from the right side of the heart into the blood vessels of the lung. When blood enters the small capillaries of the lung (called the pulmonary capillaries), fresh oxygen enters the blood and carbon dioxide is removed. This is called "gas exchange" or "respiration".