Which blood vessels connect the two sides of the vascular system?.
Capillaries.
Arteries.
Venules.
Veins.
The Correct Answer is A
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
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 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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