Departures from the physical optimality in the bronchial tree of rats (Rattus norvegicus)

We studied the departure from the physical optimality of the bronchial tree of rats using both i) the minimum volume and power and ii) the minimum surface and drag criteria, considering the bronchial junction as the unit study based on Zamir's model for vascular trees. Our results show deviatio...

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Autores principales:	CANALS M,MAURICIO, ATALA,CRISTIAN, OLIVARES,RICARDO, NOVOA,FRANCISCO F, ROSENMANN,MARIO
Lenguaje:	English
Publicado:	Sociedad de Biología de Chile 2002
Materias:	Lung Junction optimality Optimization Broncography
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602002000300015
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spelling	oai:scielo:S0716-976020020003000152003-11-26Departures from the physical optimality in the bronchial tree of rats (Rattus norvegicus)CANALS M,MAURICIOATALA,CRISTIANOLIVARES,RICARDONOVOA,FRANCISCO FROSENMANN,MARIO Lung Junction optimality Optimization Broncography We studied the departure from the physical optimality of the bronchial tree of rats using both i) the minimum volume and power and ii) the minimum surface and drag criteria, considering the bronchial junction as the unit study based on Zamir's model for vascular trees. Our results show deviations of the junctions of the bronchial tree from the expected optimums in the proximal airway that can be explained by both, the turbulent or transitional flow regime, and the airway's necessity to distribute its terminal branches in the alveolar surface filling the thoracic volume. The departures of the observed values at the optimum for the minimum volume and power were significantly different than the obtained departure values for the minimum surface and drag criteria. The departure from the optimum was directly related to the diameter of the smallest branch. The slopes of the regressions for the two criteria were different. The regression lines intercept at a bronchial diameter d2 = 0.129 mm. This result agreed with the idea that the tube diameter is limited at small values by the increasing flow resistance with decreasing tube diameter while at large values is limited by the increasing tube volume and dead space with increasing tube diameterinfo:eu-repo/semantics/openAccessSociedad de Biología de ChileBiological Research v.35 n.3-4 20022002-01-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602002000300015en10.4067/S0716-97602002000300015
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	Lung Junction optimality Optimization Broncography
spellingShingle	Lung Junction optimality Optimization Broncography CANALS M,MAURICIO ATALA,CRISTIAN OLIVARES,RICARDO NOVOA,FRANCISCO F ROSENMANN,MARIO Departures from the physical optimality in the bronchial tree of rats (Rattus norvegicus)
description	We studied the departure from the physical optimality of the bronchial tree of rats using both i) the minimum volume and power and ii) the minimum surface and drag criteria, considering the bronchial junction as the unit study based on Zamir's model for vascular trees. Our results show deviations of the junctions of the bronchial tree from the expected optimums in the proximal airway that can be explained by both, the turbulent or transitional flow regime, and the airway's necessity to distribute its terminal branches in the alveolar surface filling the thoracic volume. The departures of the observed values at the optimum for the minimum volume and power were significantly different than the obtained departure values for the minimum surface and drag criteria. The departure from the optimum was directly related to the diameter of the smallest branch. The slopes of the regressions for the two criteria were different. The regression lines intercept at a bronchial diameter d2 = 0.129 mm. This result agreed with the idea that the tube diameter is limited at small values by the increasing flow resistance with decreasing tube diameter while at large values is limited by the increasing tube volume and dead space with increasing tube diameter
author	CANALS M,MAURICIO ATALA,CRISTIAN OLIVARES,RICARDO NOVOA,FRANCISCO F ROSENMANN,MARIO
author_facet	CANALS M,MAURICIO ATALA,CRISTIAN OLIVARES,RICARDO NOVOA,FRANCISCO F ROSENMANN,MARIO
author_sort	CANALS M,MAURICIO
title	Departures from the physical optimality in the bronchial tree of rats (Rattus norvegicus)
title_short	Departures from the physical optimality in the bronchial tree of rats (Rattus norvegicus)
title_full	Departures from the physical optimality in the bronchial tree of rats (Rattus norvegicus)
title_fullStr	Departures from the physical optimality in the bronchial tree of rats (Rattus norvegicus)
title_full_unstemmed	Departures from the physical optimality in the bronchial tree of rats (Rattus norvegicus)
title_sort	departures from the physical optimality in the bronchial tree of rats (rattus norvegicus)
publisher	Sociedad de Biología de Chile
publishDate	2002
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602002000300015
work_keys_str_mv	AT canalsmmauricio departuresfromthephysicaloptimalityinthebronchialtreeofratsrattusnorvegicus AT atalacristian departuresfromthephysicaloptimalityinthebronchialtreeofratsrattusnorvegicus AT olivaresricardo departuresfromthephysicaloptimalityinthebronchialtreeofratsrattusnorvegicus AT novoafranciscof departuresfromthephysicaloptimalityinthebronchialtreeofratsrattusnorvegicus AT rosenmannmario departuresfromthephysicaloptimalityinthebronchialtreeofratsrattusnorvegicus
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Departures from the physical optimality in the bronchial tree of rats (Rattus norvegicus)

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