Riddle

I transfer oxygen from the atmosphere to your blood. What am I?

Choose an answer

A.Heart
B.Bloodstream
C.Nose
D.Lungs
Hint: It's a word with 5 letters, starting with "L".

Answer

Lungs

Why this is the answer

Your lungs pull oxygen from the air you breathe and pass it into your bloodstream.

This riddle is filed under "What Am I?" Riddles and rated Medium.