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Which of the following statements is(are) accurate regarding veins?
- A. Veins are deeper than arteries.
- B. Veins carry deoxygenated blood.
- C. Veins carry blood back to the heart.
- D. Vein walls are thicker than arterial walls.
Correct Answer: B,C
Rationale: Veins carry deoxygenated blood back to the heart, while arteries carry oxygenated blood away. Vein walls are thinner, not thicker, than arterial walls.
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What color tubes will you need for these tests?
- A. Red
- B. Gray
- C. Light blue
- D. Yellow
- E. Lavender
- F. Green
Correct Answer: D,E,F
Rationale: Blood cultures use yellow tubes, complete blood count uses lavender, electrolytes use green, and glucose uses gray (though red is sometimes used for chemistry tests, green is standard for electrolytes).
Which one of the following statements is not accurate when describing veins and arteries?
- A. Veins have valves; arteries do not.
- B. Valves control the direction of blood flow in veins.
- C. Arteries have higher blood pressure than veins.
- D. Veins have thicker walls than arteries.
- E. Veins must fight against gravity to return blood to the heart.
Correct Answer: D
Rationale: Veins have thinner walls than arteries, which have thicker walls to withstand higher blood pressure.
When performing dermal punctures, what sites are commonly used in an infant, older child, and adult?
- A. Heel for infants, finger for older children and adults
- B. Earlobe for infants, finger for older children and adults
- C. Heel for infants, earlobe for older children, finger for adults
- D. Finger for all ages
Correct Answer: A
Rationale: The heel is used for infants due to safety and accessibility, while fingers are used for older children and adults for dermal punctures.
The vein of choice for phlebotomy is
- A. The median cubital.
- B. The basilic.
- C. The cephalic.
- D. Any vein that is not tortuous.
Correct Answer: A
Rationale: The median cubital vein is preferred for phlebotomy due to its accessibility, size, and stability.
In what sequence will you draw the colored tubes?
- A. Yellow
- B. Lavender
- C. Green
- D. Gray
Correct Answer: A,B,C,D
Rationale: The order of draw is yellow (blood cultures) first to prevent contamination, followed by lavender (CBC), green (electrolytes), and gray (glucose) to minimize additive carryover.