Which of the following is true regarding normal quiet expiration of air?
It depends on the complete lack of surface tension on the alveolar wall.
It is driven by increased blood CO2 levels.
It is a passive process that depends on the relaxation of inspiratory muscles.
It requires contraction of abdominal wall muscles.
The Correct Answer is C
A. It depends on the complete lack of surface tension on the alveolar wall: Alveoli have surface tension; pulmonary surfactant reduces surface tension but does not eliminate it. Quiet expiration does not require an absence of surface tension.
B. It is driven by increased blood CO₂ levels: Elevated CO₂ increases the drive to breathe (affects ventilation rate), but quiet expiration itself is not actively driven by CO₂ -it is passive.
C. It is a passive process that depends on the relaxation of inspiratory muscles: Quiet expiration occurs when the diaphragm and external intercostals relax and elastic recoil of the lungs and chest wall returns air to atmosphere.
D. It requires contraction of abdominal wall muscles: Abdominal muscle contraction is used for forced expiration (e.g., coughing or heavy exercise), not normal quiet expiration.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is C
Explanation
A. Mastication: Mastication is the mechanical chewing of food that occurs in the mouth to break food into smaller pieces -not related to bile emulsifying fats.
B. Peristalsis: Peristalsis are wave-like smooth muscle contractions that propel contents through the GI tract -helps move chyme but does not chemically/physically disperse fat droplets like bile does.
C. Emulsification: Emulsification is the process by which bile salts surround and break large fat globules into many small droplets, increasing surface area for lipase action.
D. Deglutition: Deglutition is the act of swallowing, moving a bolus from the mouth into the pharynx and esophagus -not the process of bile acting on lipids.
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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