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GAS EXCHANGE, PULMONARY MECHANICS AN...

LUTCAVAGE, MOLLY ELLEN.

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GAS EXCHANGE, PULMONARY MECHANICS AND DIVING IN THE LOGGERHEAD SEA TURTLE, CARETTA CARETTA.

Record Type:	Language materials, printed : Monograph/item
Title/Author:	GAS EXCHANGE, PULMONARY MECHANICS AND DIVING IN THE LOGGERHEAD SEA TURTLE, CARETTA CARETTA./
Author:	LUTCAVAGE, MOLLY ELLEN.
Description:	148 p.
Notes:	Source: Dissertation Abstracts International, Volume: 48-10, Section: B, page: 2894.
Contained By:	Dissertation Abstracts International48-10B.
Subject:	Biology, Zoology. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=8729347

GAS EXCHANGE, PULMONARY MECHANICS AND DIVING IN THE LOGGERHEAD SEA TURTLE, CARETTA CARETTA.
LUTCAVAGE, MOLLY ELLEN.

GAS EXCHANGE, PULMONARY MECHANICS AND DIVING IN THE LOGGERHEAD SEA TURTLE, CARETTA CARETTA. - 148 p.

Source: Dissertation Abstracts International, Volume: 48-10, Section: B, page: 2894.

Thesis (Ph.D.)--University of Miami, 1987.

The anatomy, gas conductance and mechanical properties of the loggerhead sea turtle lung were studied in relation to experimental gas exchange, breathing patterns and voluntary diving at 25$\sp\circSubjects--Topical Terms:

1018632
Biology, Zoology.

GAS EXCHANGE, PULMONARY MECHANICS AND DIVING IN THE LOGGERHEAD SEA TURTLE, CARETTA CARETTA.
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035 $a (UMI)AAI8729347
035 $a AAI8729347
040 $a UMI $c UMI
100 1 $a LUTCAVAGE, MOLLY ELLEN. $3 1277268
245 1 0 $a GAS EXCHANGE, PULMONARY MECHANICS AND DIVING IN THE LOGGERHEAD SEA TURTLE, CARETTA CARETTA.
300 $a 148 p.
500 $a Source: Dissertation Abstracts International, Volume: 48-10, Section: B, page: 2894.
502 $a Thesis (Ph.D.)--University of Miami, 1987.
520 $a The anatomy, gas conductance and mechanical properties of the loggerhead sea turtle lung were studied in relation to experimental gas exchange, breathing patterns and voluntary diving at 25$\sp\circ $c . Pulmonary CO diffusion capacity, lung volume, oxygen uptake and pulmonary blood flow were measured simultaneously in turtles (8-11 kg) using a gas rebreathing technique. Calculated diffusion and O$\sb2$ uptake values are approximately twice those of non-varanid reptiles and about 33% of that of resting mammals. Estimated lung-capillary O$\sb2$ gradient shows that only a small driving gradient is required for O$\sb2$ conductance across the lung. Pulmonary blood flow values relative to other reptiles were high, which based on the Fick principle results in a substantial blood convection requirement.
520 $a Distinctive anatomical features of the sea turtle respiratory system enable ventilatory flow rates equivalent to that measured in some marine mammals. Mechanical studies of intact and isolated lungs show that respiratory system compliance (10.7 $\pm$ 4.9 ml cm H$\sb2 $o kg$\sp{-1}$) is similar to that of reptiles having less complex lungs. Peak simulated expiratory flow rate in excised lungs averaged nearly 200 ml sec$\sp{-1} $k g$\sp{-1}$, while during spontaneous breathing expiratory flow rates were $> $2 0 ml sec$\sp{-1} $k g$\sp{-1}$. Gas transport and diving patterns were studied in unrestrained turtles breathing air or a hypercapnic (5% CO$\sb2$) mixture. Turtles breathing air have an episodic, low frequency ventilation pattern. Inspired CO$\sb2$ produced a 20-30% increase in total ventilation but no change in dive length or tidal volume.
520 $a During spontaneous diving arterial blood gases sampled from chronically implanted catheters showed a steady decline in pO$\sb2$. While paCO$\sb2$ and pH changes were modest, plasma HCO$\sb3\sp-$ increased by as much as 200% over predive values. Turtles surfaced to breathe following depletion of lung and tissue O$\sb2$ stores.
590 $a School code: 0125.
650 4 $a Biology, Zoology. $3 1018632
690 $a 0472
710 2 $a University of Miami. $3 1017483
773 0 $t Dissertation Abstracts International $g 48-10B.
790 $a 0125
791 $a Ph.D.
792 $a 1987
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=8729347