What happens to blood when it is pumped ...

What happens to blood when it is pumped into the thin-walled blood vessels of the lungs?

A

Platelets are exchanged for plasma.

B

Carbon dioxide is replaced with oxygen.

C

Blood fills the lungs and causes coughing.

D

Nothing - the lungs are just a place blood goes through on its way back to the heart.

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The correct Answer is:

B

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