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 C
Explanation
Choice A rationale:
A pneumothorax, or collapsed lung, occurs when air leaks into the space between the lung and chest wall. This is not directly caused by pressure in the lungs dropping lower than atmospheric pressure.
Choice B rationale:
Bronchioles constricting could lead to respiratory distress, but this is not a direct result of the pressure in the lungs dropping lower than atmospheric pressure.
Choice C rationale:
When the pressure within the lungs drops lower than atmospheric pressure, air flows into the lungs. This is a fundamental principle of respiration.
Choice D rationale:
Air flows out of the lungs when the pressure within the lungs rises above atmospheric pressure, not when it drops.
Correct Answer is C
Explanation
Choice A rationale:
The build-up of plaque in the arteries is a specific type of arteriosclerosis known as atherosclerosis.
Choice B rationale:
Aging of the arteries is not a precise definition of arteriosclerosis.
Choice C rationale:
Arteriosclerosis is characterized by the abnormal thickening, hardening, and loss of elasticity of the arteries.
Choice D rationale:
Stretching of the arteries is not a characteristic of arteriosclerosis.
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