The HIV virus invades:.
Helper T cells (CD4 cells) eventually destroying them.
D cells.
B cells.
Helper C cells.
The Correct Answer is A
Choice A rationale:
HIV invades various immune cells, most notably CD4+ T cells, eventually destroying them.
Choice B rationale:
D cells are not a recognized category of immune cells, and HIV does not specifically invade them.
Choice C rationale:
While B cells are part of the immune system, HIV primarily targets CD4+ T cells, not B cells.
Choice D rationale:
Helper C cells are not a recognized category of immune cells, and HIV does not specifically invade them.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is D
Explanation
Choice A rationale:
Low blood viscosity is not the primary reason blood constantly circulates. It is the heart that creates the pressure increase in arteries that pushes blood through the body.
Choice B rationale:
Vasoconstriction and dilation are not the primary reasons blood constantly circulates. They are mechanisms that help regulate blood flow and pressure, but the constant circulation of blood is due to the beating of the heart.
Choice C rationale:
Pressure gradients play a role in blood circulation, but they are not the primary reason blood constantly circulates. The heart is the organ that creates the pressure increase in arteries that pushes blood through the body.
Choice D rationale:
The beating of the heart is the primary reason that blood constantly circulates throughout the body.
Correct Answer is A
Explanation
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.
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