Matches in SemOpenAlex for { <https://semopenalex.org/work/W2115724384> ?p ?o ?g. }
- W2115724384 endingPage "2357" @default.
- W2115724384 startingPage "2349" @default.
- W2115724384 abstract "ABSTRACT The unidirectional gas-flow pattern through the avian lung is thought to result from ‘aerodynamic valves’; support for this hypothesis lies mainly in the failure to find any evidence for anatomical valves. During expiration, air flows from the caudal air sacs through the major exchange area of the lung, the paleopulmonic parabronchi, instead of bypassing the lungs via the intrapulmonary bronchus. We tested whether the effectiveness of this expiratory flow control mechanism depends on aerodynamic factors, especially convective inertial forces that depend on gas density and flow velocity. In pump-ventilated, anaesthetized geese, a bolus of tracer gas was introduced into both the right and left caudal thoracic air sacs during an end-inspiratory pause. During the first expiration, the rise of tracer levels within the caudal trachea was measured. Valve efficacy was positively correlated with the AO rate of expiratory gas flow, (range 8–200 ml s-1). At flows assumed to occur during exercise in geese , the expiratory valve efficacy was approximately 95 %; it was less effective at lower flows. Surprisingly, the density (ρ) of the background gas (ρ of He/O2=0.43 g l-1, Ar/O2=1.72 g l-1 or SF6/O2=5.50 g l-1) had no effect on expiratory valving. We suggest two possible mechanisms that might explain this unusual combination of flow dependence without density dependence. (1) If airway geometry changes occurred between experiments with different gases, flow in the vicinity of the expiratory valve may have varied independently from flow measured at the airway opening. (2) Alternatively, valving may depend on dynamic compression of the intrapulmonary bronchus, which could depend mainly on viscous resistance and thus on flow velocity but not gas density." @default.
- W2115724384 created "2016-06-24" @default.
- W2115724384 creator A5036753571 @default.
- W2115724384 creator A5036772442 @default.
- W2115724384 creator A5042673550 @default.
- W2115724384 creator A5050686129 @default.
- W2115724384 creator A5053278128 @default.
- W2115724384 creator A5091082571 @default.
- W2115724384 date "1995-11-01" @default.
- W2115724384 modified "2023-10-15" @default.
- W2115724384 title "The Avian Lung: Is There an Aerodynamic Expiratory Valve?" @default.
- W2115724384 cites W1926925957 @default.
- W2115724384 cites W1943542700 @default.
- W2115724384 cites W1964326087 @default.
- W2115724384 cites W1980793378 @default.
- W2115724384 cites W1986257598 @default.
- W2115724384 cites W1987870964 @default.
- W2115724384 cites W1992065274 @default.
- W2115724384 cites W1998241685 @default.
- W2115724384 cites W2019965509 @default.
- W2115724384 cites W2033419328 @default.
- W2115724384 cites W2045424005 @default.
- W2115724384 cites W2061401200 @default.
- W2115724384 cites W2067557046 @default.
- W2115724384 cites W2067710248 @default.
- W2115724384 cites W2083888465 @default.
- W2115724384 cites W2090470216 @default.
- W2115724384 cites W2092130564 @default.
- W2115724384 cites W2125978497 @default.
- W2115724384 cites W2166969617 @default.
- W2115724384 cites W2171597568 @default.
- W2115724384 cites W2224955343 @default.
- W2115724384 cites W2320185725 @default.
- W2115724384 cites W4230471810 @default.
- W2115724384 doi "https://doi.org/10.1242/jeb.198.11.2349" @default.
- W2115724384 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/9320272" @default.
- W2115724384 hasPublicationYear "1995" @default.
- W2115724384 type Work @default.
- W2115724384 sameAs 2115724384 @default.
- W2115724384 citedByCount "41" @default.
- W2115724384 countsByYear W21157243842013 @default.
- W2115724384 countsByYear W21157243842014 @default.
- W2115724384 countsByYear W21157243842015 @default.
- W2115724384 countsByYear W21157243842016 @default.
- W2115724384 countsByYear W21157243842017 @default.
- W2115724384 countsByYear W21157243842018 @default.
- W2115724384 countsByYear W21157243842019 @default.
- W2115724384 countsByYear W21157243842021 @default.
- W2115724384 countsByYear W21157243842022 @default.
- W2115724384 countsByYear W21157243842023 @default.
- W2115724384 crossrefType "journal-article" @default.
- W2115724384 hasAuthorship W2115724384A5036753571 @default.
- W2115724384 hasAuthorship W2115724384A5036772442 @default.
- W2115724384 hasAuthorship W2115724384A5042673550 @default.
- W2115724384 hasAuthorship W2115724384A5050686129 @default.
- W2115724384 hasAuthorship W2115724384A5053278128 @default.
- W2115724384 hasAuthorship W2115724384A5091082571 @default.
- W2115724384 hasConcept C105702510 @default.
- W2115724384 hasConcept C105922876 @default.
- W2115724384 hasConcept C121332964 @default.
- W2115724384 hasConcept C126322002 @default.
- W2115724384 hasConcept C185592680 @default.
- W2115724384 hasConcept C27101514 @default.
- W2115724384 hasConcept C2776164194 @default.
- W2115724384 hasConcept C2777714996 @default.
- W2115724384 hasConcept C42219234 @default.
- W2115724384 hasConcept C534529494 @default.
- W2115724384 hasConcept C57879066 @default.
- W2115724384 hasConcept C71924100 @default.
- W2115724384 hasConceptScore W2115724384C105702510 @default.
- W2115724384 hasConceptScore W2115724384C105922876 @default.
- W2115724384 hasConceptScore W2115724384C121332964 @default.
- W2115724384 hasConceptScore W2115724384C126322002 @default.
- W2115724384 hasConceptScore W2115724384C185592680 @default.
- W2115724384 hasConceptScore W2115724384C27101514 @default.
- W2115724384 hasConceptScore W2115724384C2776164194 @default.
- W2115724384 hasConceptScore W2115724384C2777714996 @default.
- W2115724384 hasConceptScore W2115724384C42219234 @default.
- W2115724384 hasConceptScore W2115724384C534529494 @default.
- W2115724384 hasConceptScore W2115724384C57879066 @default.
- W2115724384 hasConceptScore W2115724384C71924100 @default.
- W2115724384 hasIssue "11" @default.
- W2115724384 hasLocation W21157243841 @default.
- W2115724384 hasLocation W21157243842 @default.
- W2115724384 hasOpenAccess W2115724384 @default.
- W2115724384 hasPrimaryLocation W21157243841 @default.
- W2115724384 hasRelatedWork W1545152016 @default.
- W2115724384 hasRelatedWork W1996382805 @default.
- W2115724384 hasRelatedWork W201013270 @default.
- W2115724384 hasRelatedWork W2038136228 @default.
- W2115724384 hasRelatedWork W2091926604 @default.
- W2115724384 hasRelatedWork W2258875363 @default.
- W2115724384 hasRelatedWork W2266430394 @default.
- W2115724384 hasRelatedWork W2339919694 @default.
- W2115724384 hasRelatedWork W2415692606 @default.
- W2115724384 hasRelatedWork W43861927 @default.
- W2115724384 hasVolume "198" @default.
- W2115724384 isParatext "false" @default.