The reason blood constantly circulates is because of?.
Low blood viscosity.
Vasoconstriction and dilation.
Pressure gradients.
The beating of the heart.
The Correct Answer is D
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.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
Choice A rationale:
Capillaries are the smallest blood vessels that connect arteries and veins. They allow nutrients in the blood to diffuse to the body’s tissues.
Choice B rationale:
Arteries carry oxygen-rich blood from the heart to the tissues of the body. They do not connect the two sides of the vascular system.
Choice C rationale:
Venules are very small blood vessels that connect capillaries with veins throughout the body. They do not connect the two sides of the vascular system.
Choice D rationale:
Veins carry blood back toward the heart. They do not connect the two sides of the vascular system
Correct Answer is D
Explanation
Choice A rationale:
Innate immunity is not an acquired immunity. Acquired immunity refers to immunity that develops after exposure to a specific pathogen.
Choice B rationale:
Innate immunity does not retain a memory of a pathogen after defeating it. This is a characteristic of adaptive immunity.
Choice C rationale:
Innate immunity does not offer protection against a particular pathogen. It provides a general defense against a wide range of invaders.
Choice D rationale:
Innate immunity is present at birth. It provides a fast response that involves first- and second-line defenses.
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