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 D
Explanation
Choice A rationale:
Thoracotomy is a surgical procedure to gain access to the thoracic organs, not specifically for removing air from the pleural space.
Choice B rationale:
A lung biopsy involves removing lung tissue for examination, not removing air from the pleural space.
Choice C rationale:
Lung re-expansion is the goal of the procedure, not the procedure itself.
Choice D rationale:
A chest tube is inserted to remove air from the pleural space and re-establish negative pressure so the lung can re-expand3.
Correct Answer is A
Explanation
The correct answer is Choice A.
Choice A rationale:
The pleural fluid functions by lubricating the space between the pleura, allowing the pleura to glide smoothly during inhalation and exhalation. This cushions delicate lung tissues against friction from the ribs and the chest wall itself.
Choice B rationale:
The fluid in the pleural cavity does not warm and moisten lung tissue. This is not one of its primary functions.
Choice C rationale:
The fluid in the pleural cavity does not prevent bacteria from entering lung tissue. This is not one of its primary functions.
Choice D rationale:
The fluid in the pleural cavity does not assist in the diffusion of oxygen across the respiratory membrane. This is not one of its primary functions.
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