What is one of the purposes of the fluid in the pleural cavity?.
Lubricate the pleural surfaces to allow them to glide painlessly during lung expansion and contraction.
Warm and moisten lung tissue.
Prevent bacteria from entering lung tissue.
Assist in the diffusion of oxygen across the respiratory membrane.
The Correct Answer is A
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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Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
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.
Correct Answer is C
Explanation
Choice A rationale:
A pneumothorax, or collapsed lung, occurs when air leaks into the space between the lung and chest wall. This is not directly caused by pressure in the lungs dropping lower than atmospheric pressure.
Choice B rationale:
Bronchioles constricting could lead to respiratory distress, but this is not a direct result of the pressure in the lungs dropping lower than atmospheric pressure.
Choice C rationale:
When the pressure within the lungs drops lower than atmospheric pressure, air flows into the lungs. This is a fundamental principle of respiration.
Choice D rationale:
Air flows out of the lungs when the pressure within the lungs rises above atmospheric pressure, not when it drops.
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