During a blood drive, shaun noticed that the nurse punctured his vein to connect the tube for withdrawing blood. why is blood obtained through veins and not from arteries when collecting blood? a. veins have lower blood pressure than arteries. b. veins have fewer valves than arteries. c. veins have a larger diameter than arteries. d. veins have more tissue layers than arteries.
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During a blood drive, shaun noticed that the nurse punctured his vein to connect the tube for withdr...
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