★ Circulatory / Respiratory Quiz
Which of the following transport oxygen in humans
A. hemoglobin
B. melanin
C. keratin
D. urea
E. bicarbonate ions
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Two thin membranes surround the lungs. What are these membranes called?
A. pericardial membranes
B. pleural membranes
C. meninges
D. cilia
E. capsules
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