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.
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Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is C
Explanation
hoice A rationale:
Cilia do not propel air into the lungs, they are involved in moving mucus and trapped particles.
Choice B rationale:
Cilia do not trap food or prevent its entry into the windpipe. This is the role of the epiglottis, not cilia.
Choice C rationale:
Cilia in the airways help to propel trapped debris and mucus upward to be expelled by the body.
Choice D rationale:
Cilia do not have a role in olfaction or the sense of smell.
Correct Answer is A
Explanation
Choice A rationale:
The lymphatic system has many functions, including immunity, absorption of fats, and the maintenance of fluid balance. Choices B and C rationale: While the lymphatic system does play a role in immunity and maintaining fluid balance, these are not its only functions.
Choice D rationale:
The lymphatic system does not directly regulate electrolyte balance.
So, the correct answer is Choice A, after analyzing all choices.
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