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. Dyspnea: Dyspnea means difficult or labored breathing (shortness of breath), not normal resting breathing.
B. Eupnea: Eupnea refers to normal, unlabored breathing at rest.
C. Apnea: Apnea means a temporary absence of breathing (no breathing), not normal respiration.
D. Hyperpnea: Hyperpnea means increased depth and/or rate of breathing (e.g., during exercise), not the normal resting pattern.
Correct Answer is C
Explanation
A. Loop of Henle: The Loop of Henle is the U-shaped segment of the nephron that extends into the medulla and concentrates urine.
B. Proximal Convoluted Tubule: The PCT is the first convoluted segment after Bowman's capsule and is responsible for bulk reabsorption of solutes and water.
C. Bowman's Capsule: Bowman's capsule is the double-walled cup that surrounds the glomerular capillary tuft and collects filtrate.
D. Glomerulus: The glomerulus is the capillary tuft inside Bowman's capsule that performs plasma filtration.
E. Collecting Duct: The collecting duct collects filtrate from multiple nephrons and participates in final water/solute adjustments.
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