What drives the air out of the lungs during quiet expiration?
Contraction of smooth muscles in airways
Surface tension and the elastic recoil of lung tissues
Contraction of the diaphragm
Contraction of the external intercostal muscles
The Correct Answer is B
A. Contraction of smooth muscles in airways -Smooth muscle constriction occurs in forced breathing or pathology, not quiet expiration.
B. Surface tension and the elastic recoil of lung tissues -Quiet expiration is passive, driven by elastic recoil and alveolar surface tension.
C. Contraction of the diaphragm -The diaphragm relaxes during expiration.
D. Contraction of the external intercostal muscles -These contract during inspiration, not expiration.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
A. Cellular respiration: Cellular respiration (glycolysis, Krebs cycle, oxidative phosphorylation) produces ATP
B. External respiration: External respiration is gas exchange between lungs and blood, not the ATP-producing biochemical process
C. Ventilation: Ventilation (breathing) moves air in/out of lungs but does not itself synthesize ATP
D. Internal respiration: Internal respiration is gas exchange between blood and tissues, not the intracellular ATP-producing pathways
Correct Answer is {"dropdown-group-1":"A"}
Explanation
Correct answer: Greater omentum
The circled tan, apron-like fold lying over the coils of intestine is the greater omentum, a fatty peritoneal fold that hangs from the greater curvature of the stomach and drapes over the small intestines (functions: fat storage, immune cell housing, and limiting spread of intraperitoneal infections).
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