What is the main reason blood flow is slowest in the capillaries?
Capillaries have to fight the pull of gravity.
Capillaries have a great cross-sectional area.
Capillary blood has a higher viscosity than venous blood.
Capillaries have a higher osmotic pressure.
The Correct Answer is B
Choice A rationale:
Gravity does not significantly affect blood flow in capillaries.
Choice B rationale:
The total cross-sectional area of capillaries is greater than that of other blood vessels, which slows down the blood flow, allowing time for exchange of gases and nutrients.
Choice C rationale:
While blood viscosity can affect blood flow, it is not the main reason for slow blood flow in capillaries.
Choice D rationale:
Capillaries do not have higher osmotic pressure than other blood vessels.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
Choice A rationale:
T cells mature in the thymus.
Choice B rationale:
While red bone marrow is where all blood cells, including T cells, originate, T cells specifically mature in the thymus. Choices C and D rationale: Tonsils and the spleen are parts of the lymphatic system, but they are not where T cells mature.
So, the correct answer is Choice A, after analyzing all choices.
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.
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