Anatomy & TerminologyQuestion 95 of 100
Which structural feature of veins is most relevant to venipuncture technique?
a.Veins have thicker muscular walls than arteries
b.Veins carry blood away from the heart
c.Veins have one-way valves and thinner walls, so they collapse easily under strong vacuum
d.Veins pulsate under the fingertip
Explanation
Veins have thin walls and one-way valves that keep blood moving toward the heart, which is why a large vacuum tube or aggressive suction can collapse them and why needles are inserted pointing toward the heart away from valves. Arteries, not veins, have thick muscular walls and a palpable pulse. Arteries carry blood away from the heart while veins return it.
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