What is the purpose of valves in veins?.
Prevent backflow of blood.
Aid in redirection of blood flow.
Keep oxygenated blood from mixing with unoxygenated blood.
Aid in the pumping of blood.
The Correct Answer is A
Veins have valves that ensure blood flows toward your heart. They work hard, against gravity, to bring the blood that flowed down via arteries back up to your heart. This prevents the backflow of blood.
Choice B rationale:
Veins do not aid in the redirection of blood flow. Their primary function is to return deoxygenated blood from the body back to the heart.
Choice C rationale:
The function of preventing oxygenated blood from mixing with unoxygenated blood is not performed by the valves in veins but by the structure of the circulatory system itself.
Choice D rationale:
While veins do aid in the circulation of blood, they do not aid in the pumping of blood. The pumping action is performed by the heart.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
Choice A rationale:
Inhaled food or foreign objects are most likely to lodge in the right bronchus because it is wider and more vertical than the left.
Choice B rationale:
While it is possible for objects to lodge in the left bronchus, it is less common due to its narrower and less vertical structure.
Choice C rationale:
Bronchioles are smaller structures within the respiratory system where foreign objects are less likely to lodge.
Choice D rationale:
The pharynx is not the most common location for inhaled food or foreign objects to lodge.
Correct Answer is B
Explanation
Choice A rationale:
Atherosclerosis does not involve the stretching of arteries.
Choice B rationale:
Atherosclerosis is characterized by the hardening of the arteries due to the buildup of plaque.
Choice C rationale:
Aging of the arteries is not the correct term for atherosclerosis.
Choice D rationale:
While plaque buildup is a feature of atherosclerosis, this choice does not fully capture the hardening aspect of the condition.
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