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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.

Respuesta :

A, venus has elower blood pressure than arteries.

Answer:

A. Veins have lower blood pressure than arteries.

Explanation:

During blood sampling, blood is taken from veins as they are present closer to the skin. They have thin walls and no valves. Lower blood pressure in veins as compared to arteries ensures that puncturing the vein does not cause blood loss in higher amount. Arteries have higher blood pressure and puncturing them may cause blood to seep out from the puncture point.

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