Biology
Normal adult human male has

24 gram of haemoglobin/100 gram of blood
18 gram of haemoglobin/100 gram of blood
10 gram of haemoglobin/100 gram of blood
14 gram of haemoglobin/100 gram of blood

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Biology
Which of the following is true about veins?

Veins have a smaller diameter lumen than arteries
Veins have valves; arteries do not
Veins carry blood away from the heart, while arteries carry blood to the heart
Veins are more muscular than arteries

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