Veins are called capacitance vessels because:.
They convey blood back to the heart.
They can stretch.
They contain one-way valves.
They can constrict extensively.
The Correct Answer is B
Choice A rationale:
While veins do convey blood back to the heart, this is not the reason they are called capacitance vessels.
Choice B rationale:
Veins are referred to as capacitance vessels because they can stretch and contain about 60% of the body’s blood volume.
Choice C rationale:
Although veins contain one-way valves, this characteristic does not define them as capacitance vessels.
Choice D rationale:
Veins can constrict, but this is not the primary reason they are known as capacitance vessels.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is C
Explanation
Choice A rationale:
Increased blood viscosity is not typically associated with atherosclerosis. While high blood viscosity can contribute to cardiovascular problems, it is not a condition that you would expect to accompany atherosclerosis.
Choice B rationale:
Irregular heartbeat, or arrhythmia, is not typically a condition that accompanies atherosclerosis. While atherosclerosis can increase the risk of certain types of arrhythmias, it is not a direct result of the disease.
Choice C rationale:
High blood pressure, or hypertension, is often associated with atherosclerosis. The buildup of plaque in the arteries causes them to narrow and stiffen, which increases the resistance to blood flow and consequently increases blood pressure.
Choice D rationale:
Low blood pressure is not typically associated with atherosclerosis. Atherosclerosis tends to increase blood pressure rather than decrease it.
Correct Answer is B
Explanation
The correct answer is Choice B.
Choice A rationale:
Nitrogen is the most abundant gas in the atmosphere, but it is not the primary regulator of respiration.
Choice B rationale:
Carbon dioxide (CO2) is the main chemical regulator of respiration and the potent stimulus of the respiratory centers via the arterial chemoreceptors and directly on the central chemoreceptors.
Choice C rationale:
Oxygen is essential for cellular respiration, but it is not the primary regulator of respiration.
Choice D rationale:
Bicarbonate plays a role in maintaining the pH balance in the blood and is not the primary regulator of respiration.
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