When a doctor or nurse takes a blood sample from a person they use a needle to penetrate a vein, not an artery.
Which reasons explain why veins are used?
1 Arteries carry blood under more pressure than veins.
2 Arteries have a thicker middle layer than veins.
3 Veins carry deoxygenated blood.
4 Veins have a larger lumen than arteries.
1 )
1, 2, 3 and 4
2 )
1, 2 and 3 only
1, 2 and 4 only
4 )
3 and 4 only
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