Which statement about diffusion of gas across the alveolar capillary membrane is true?
Diffusion of gas does not depend on the partial pressure gradient
Gas diffuses from high partial pressure to low partial pressure
Gas diffuses from low partial pressure to high partial pressure
Equilibrium can be reached without partial pressure gradient
The Correct Answer is B
A. Diffusion of gas does not depend on the partial pressure gradient: Incorrect -gas diffusion across membranes depends on partial pressure gradients (and membrane properties).
B. Gas diffuses from high partial pressure to low partial pressure: Correct -diffusion follows the partial pressure gradient (for example O₂ moves from alveoli where PO₂ is higher into blood where PO₂ is lower).
C. Gas diffuses from low partial pressure to high partial pressure: Incorrect -that direction would require active transport; gases passively diffuse down their gradients.
D. Equilibrium can be reached without partial pressure gradient: Incorrect -equilibrium is reached when partial pressures equalize; without a gradient diffusion won’t proceed.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
A. Muscularis externa, submucosa, mucosa, serosa: This is out of order -muscularis externa is deeper than serosa but more superficial than the mucosa, so this ordering is incorrect.
B. Mucosa, submucosa, muscularis externa, serosa: The mucosa (deepest layer lining the lumen) → submucosa → muscularis externa → serosa (outermost)is the correct sequence from deep to superficial .
C. Serosa, muscularis externa, submucosa, mucosa: This lists the layers from superficial to deep (reverse of what the question asked), so incorrect for deep to superficial.
D. Submucosa, mucosa, muscularis externa, serosa: This places submucosa deeper than mucosa (wrong); incorrect order.
Correct Answer is C
Explanation
A. Uterus: The uterus is an internal reproductive organ (the womb) and does not include the labia.
B. Fallopian tube: Fallopian (uterine) tubes are internal conduits for the oocyte; they are not the labia.
C. Vulva:The vulva is the external female genitalia and includes the labia majora and labia minora .
D. Ovary: The ovaries are internal gonads that produce oocytes and hormones; they are not the labia.
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