Biology
Which one among the following statements is correct ?

Except the pulmonary vein, all other veins carry oxygenated blood
Except the pulmonary artery, all other arteries carry oxygenated blood
All veins carry oxygenated blood
All arteries carry oxygenated blood

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Biology
Which one of the following statements regarding haemoglobin is correct?

Haemoglobin of RBC can carry both oxygen and carbon dioxide
Haemoglobin present in RBC can carry only oxygen but not carbon dioxide
Haemoglobin is only used for blood clotting and not for carrying gases
Haemoglobin of RBC can carry only carbon dioxide

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