Select all of the accurate characteristics of veins. Check All That Apply
They are thicker than arteries.
Their tunica media is less developed than in arteries.
They often have one-way valves.
They carry blood under very high pressure.
Correct Answer : B,C
A. They are thicker than arteries: veins generally have thinner walls (especially a thinner tunica media) than arteries because they carry blood at lower pressure.
B. Their tunica media is less developed than in arteries: veins have a thinner tunica media (less smooth muscle and elastic tissue) compared with arteries.
C. They often have one-way valves: many veins (especially in the limbs) have valves to prevent backflow and assist venous return against gravity.
D. They carry blood under very high pressure: veins return blood under low pressure; arteries carry blood under much higher pressure.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
A. pressure of the blood: Not primarily—systemic blood pressure is mainly from cardiac output and vascular resistance; proteins contribute minimally.
B. osmotic: Plasma proteins (especially albumin) generate colloid osmotic/oncotic pressure that pulls fluid into capillaries.
C. filtration: They oppose filtration by favoring reabsorption (their oncotic pull counters hydrostatic push).
D. central venous: CVP reflects blood volume, venous tone, and right heart function, not plasma protein levels directly.
E. hydrostatic: Hydrostatic pressure is due to fluid column and pumping; proteins affect oncotic, not hydrostatic, pressure.
Correct Answer is A
Explanation
A. Inflammation: inflammation causes vasodilation and increased capillary permeability so immune cells and plasma components reach the injured/infected tissue.
B. Activation of NK cells: NK cell activation is an innate cytotoxic response against infected or malignant cells but does not itself describe the vascular changes listed.
C. Complement activation: complement promotes opsonization, chemotaxis, and membrane attack, but the described vasodilation/permeability hallmark is inflammation.
D. Activation of mononuclear phagocytic system: activation of macrophages/monocytes contributes to defense and cleanup, but the vascular response described is specifically the inflammatory process.
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