Abstract
The avian lung has been considered to be rigid and to remain isovolumetric during the respiratory cycle. We tested this hypothesis by implanting radiopaque markers of tantalum on the dorsal pulmonary surfaces and ventral pulmonary aponeuroses of Pekin ducks (Anas platyrhynchos) and measuring changes in lung thickness during the respiratory cycle using high speed cineradiography. We found small but regular changes in lung thickness that were synchronous with respiratory phase. Lung thickness was greatest at mid-inspiration (0.6% greater than mean) and least at mid-expiration (0.8% less than mean). Measurements made on ostrich (Struthio camelus) respiratory structures suggest that the maximal force that could be generated by the muscles (Mm. costopulmonales) at the margins of the ventral pulmonary aponeurosis is more than two orders of magnitude greater than would be required to resist pressure-induced changes in lung volume during respiration at rest. The action of these muscles could account for the very small magnitute of the volume changes measured during the respiratory cycle.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 15-25 |
| Number of pages | 11 |
| Journal | Respiration Physiology |
| Volume | 59 |
| Issue number | 1 |
| DOIs | |
| State | Published - 1985 |
| Externally published | Yes |
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Keywords
- Avian lung
- Duck
- Lung
- Ostrich
- Pulmonary volume
- Respiratory muscles
ASJC Scopus subject areas
- Physiology
- Pulmonary and Respiratory Medicine
Cite this
Lung volume changes during respiration in ducks. / Jones, James H; Effmann, Eric L.; Schmidt-Nielsen, Knut.
In: Respiration Physiology, Vol. 59, No. 1, 1985, p. 15-25.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Lung volume changes during respiration in ducks
AU - Jones, James H
AU - Effmann, Eric L.
AU - Schmidt-Nielsen, Knut
PY - 1985
Y1 - 1985
N2 - The avian lung has been considered to be rigid and to remain isovolumetric during the respiratory cycle. We tested this hypothesis by implanting radiopaque markers of tantalum on the dorsal pulmonary surfaces and ventral pulmonary aponeuroses of Pekin ducks (Anas platyrhynchos) and measuring changes in lung thickness during the respiratory cycle using high speed cineradiography. We found small but regular changes in lung thickness that were synchronous with respiratory phase. Lung thickness was greatest at mid-inspiration (0.6% greater than mean) and least at mid-expiration (0.8% less than mean). Measurements made on ostrich (Struthio camelus) respiratory structures suggest that the maximal force that could be generated by the muscles (Mm. costopulmonales) at the margins of the ventral pulmonary aponeurosis is more than two orders of magnitude greater than would be required to resist pressure-induced changes in lung volume during respiration at rest. The action of these muscles could account for the very small magnitute of the volume changes measured during the respiratory cycle.
AB - The avian lung has been considered to be rigid and to remain isovolumetric during the respiratory cycle. We tested this hypothesis by implanting radiopaque markers of tantalum on the dorsal pulmonary surfaces and ventral pulmonary aponeuroses of Pekin ducks (Anas platyrhynchos) and measuring changes in lung thickness during the respiratory cycle using high speed cineradiography. We found small but regular changes in lung thickness that were synchronous with respiratory phase. Lung thickness was greatest at mid-inspiration (0.6% greater than mean) and least at mid-expiration (0.8% less than mean). Measurements made on ostrich (Struthio camelus) respiratory structures suggest that the maximal force that could be generated by the muscles (Mm. costopulmonales) at the margins of the ventral pulmonary aponeurosis is more than two orders of magnitude greater than would be required to resist pressure-induced changes in lung volume during respiration at rest. The action of these muscles could account for the very small magnitute of the volume changes measured during the respiratory cycle.
KW - Avian lung
KW - Duck
KW - Lung
KW - Ostrich
KW - Pulmonary volume
KW - Respiratory muscles
UR - http://www.scopus.com/inward/record.url?scp=0021921103&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0021921103&partnerID=8YFLogxK
U2 - 10.1016/0034-5687(85)90014-3
DO - 10.1016/0034-5687(85)90014-3
M3 - Article
C2 - 3975499
AN - SCOPUS:0021921103
VL - 59
SP - 15
EP - 25
JO - Respiratory Physiology and Neurobiology
JF - Respiratory Physiology and Neurobiology
SN - 1569-9048
IS - 1
ER -