Corpus ID: 20858520

Blood Gas Tensions and Acid-Base Regulation in the Salt-Water Crocodile, Crocodylus Porosus, at Rest and After Exhaustive Exercise

@article{Seymour1985BloodGT,
  title={Blood Gas Tensions and Acid-Base Regulation in the Salt-Water Crocodile, Crocodylus Porosus, at Rest and After Exhaustive Exercise},
  author={R. Seymour and A. F. Bennett and D. Bradford},
  journal={The Journal of Experimental Biology},
  year={1985},
  volume={118},
  pages={143-159}
}
1. 1. Salt-water crocodiles, Crocodylus porosus Schneider, were catheterized and Po2, Pco2, pH and lactate concentration ([lactate]) were measured in arterial blood during rest and after forced exhaustive activity at 30°C. 2. 2. Gas exchange ratio (R), calculated from blood Po2 and Pco2, decreased from about 1.0 to 0.3 during resting voluntary breath-holding and indicated CO2 sequestration in the body fluids. The mean value for R in undisturbed animals was 0.6, which substantiates the… Expand

Figures and Tables from this paper

Mass-Dependence of Anaerobic Metabolism and Acid-Base Disturbance During Activity in the Salt-Water Crocodile, Crocodylus Porosus
TLDR
The positive mass-dependence of acid-base disturbance could be related to the greater susceptibility of large crocodiles (>700kg) to postcapture mortality. Expand
COMPARISON OF BIOCHEMICAL STRESS INDICATORS IN JUVENILE CAPTIVE ESTUARINE CROCODILES (CROCODYLUS POROSUS) FOLLOWING PHYSICAL RESTRAINT OR CHEMICAL RESTRAINT BY MIDAZOLAM INJECTION
TLDR
It is concluded that midazolam administered in the forelimb of captive estuarine crocodiles of 2–3.5 kg provides predictable onset and duration of sedation enabling physical examination, sample collection, and translocation of the animals with minimal disturbance to lactate, pH, and CO2. Expand
Blood gases tensions and acid CID base imbalance of Cayman latirostris submitted to APNEA and pure oxygen breathing.
TLDR
A significant dependence on body weight just in end-apnea pCO2 and pO2 levels was seen, and bicarbonate decreased significantly according to body mass, which could corroborate that CO2 body storage is effective in blood p CO2 control during prolonged aerobic apnea, helping to control pH and lung oxygen uptake. Expand
Recovery from an activity-induced metabolic acidosis in the American alligator, Alligator mississippiensis.
TLDR
Recovery from this pH perturbation in the American alligator was studied by altering ventilation: following the initial metabolic acidosis and titration of bicarbonate, a relative hyperventilation prevented a further decrease in pH. Expand
Effects of Body Temperature, Mass, and Activity on Aerobic and Anaerobic Metabolism in Juvenile Crocodylus porosus
TLDR
The total metabolic input and proportion of energy supplied aerobically increased with Tb to a maximum at 33 C and may explain the increased duration of activity at higher Tb. Expand
Scaling of anaerobic metabolism during exercise in the estuarine crocodile (Crocodylus porosus)
TLDR
It is proposed that anaerobic capacity may be limited by the size of muscle glycogen reserves in smaller crocodiles and by glycolytic inhibition at the lower pH values encountered in larger crocodiles. Expand
ALLOSTERIC CONTROL OF OXYGEN BINDING BY HAEMOGLOBIN DURING EMBRYONIC DEVELOPMENT IN THE CROCODILE CROCODYLUS POROSUS: THE ROLE OF RED CELL ORGANIC PHOSPHATES AND CARBON DIOXIDE
TLDR
Neither whole-blood oxygen-affinity nor ATP level was altered in response to an experimental 7-day exposure to low ambient oxygen levels, and the results do not lend themselves easily to the pan-selectionist paradigm in which all physiological traits are viewed as being adaptive. Expand
Blood Viscosity And Hematocrit In The Estuarine Crocodile, Crocodylus porosus
TLDR
Viscosities of whole blood and plasma from Crocodylus porosus were low in comparison with other diving animals when measured over a range of shear rates at 30 degrees C, which may assist circulation during the low blood pressure events occurring during diving. Expand
CHLORIDE-DEPENDENT ORGANIC PHOSPHATE SENSITIVITY OF THE OXYGENATION REACTION IN CROCODILIAN HEMOGLOBINS
  • Weber, White
  • Biology, Medicine
  • The Journal of experimental biology
  • 1994
We show that crocodilian hemoglobins (Hbs), which previously have been considered to be model pigments lacking allosteric interaction with organic phosphate esters, do exhibit oxylabile ATP andExpand
Exercise training enhances aerobic capacity in juvenile estuarine crocodiles (Crocodylus porosus).
  • T. Owerkowicz, R. Baudinette
  • Biology, Medicine
  • Comparative biochemistry and physiology. Part A, Molecular & integrative physiology
  • 2008
TLDR
It is proposed that differences in cardiopulmonary structure and function in non-avian reptiles may be responsible for the absence (in squamates) or presence (in crocodilians) of a strong training effect on aerobic capacity. Expand
...
1
2
3
4
...

References

SHOWING 1-10 OF 72 REFERENCES
Mass-Dependence of Anaerobic Metabolism and Acid-Base Disturbance During Activity in the Salt-Water Crocodile, Crocodylus Porosus
TLDR
The positive mass-dependence of acid-base disturbance could be related to the greater susceptibility of large crocodiles (>700kg) to postcapture mortality. Expand
Acid-base imbalance in lizards during activity and recovery.
TLDR
All three lizard species make ventilatory adjustments during and after exercise that minimize disturbances to resting hydrogen ion concentrations and acid-base balance, and changes in R appear to be a useful noninvasive indicator of net blood lactate accumulation. Expand
Gas transport and blood acid-base balance in diving sea snakes.
TLDR
Large differences in PO2 between the lung and dorsal aorta indicated considerable right to left shunting either in the heart or in the lung, suggesting blood PO2 may remain relatively low despite elevated lung PO2 resulting from diving. Expand
The effects of enforced activity on ventilation, circulation and blood acid-base balance in the semi-terrestrial anuran, Bufo marinus.
TLDR
Analysis reveals that there is initially a large discrepancy between the quantity of metabolic acids buffered in the blood and the blood lactate levels. Expand
Ventilation and acid-base balance during graded activity in lizards.
TLDR
The results indicate that both lizard species maintain blood acid-base homeostasis rather effectively via ventilatory adjustments at moderate exercise intensities. Expand
The effects of enforced activity on ventilation, circulation and blood acid-base balance in the aquatic gill-less urodele, Cryptobranchus alleganiensis; a comparison with the semi-terrestrial anuran, Bufo marinus.
TLDR
It is suggested that fundamental differences between the dominant sites for gas exchange (pulmonary versus cutaneous), and thus in the control of respiratory acid-base balance, may underline the dissimilar patterns of recovery from exercise in these two species. Expand
Gas Exchange and Transport During Intermittent Breathing in Chelonian Reptiles
TLDR
Data on oxygen and carbon dioxide gas tensions in lung gas and blood from the central and peripheral arteries and veins have been measured in unrestrained, undisturbed turtles and tortoises are discussed in the light of the marked cardiovascular adjustments to intermittent breathing, which occur in chelonian reptiles. Expand
Respiratory properties of the blood of Crocodylus porosus.
TLDR
It is discussed the possibility that low levels of red cell organic phosphate may be an adaptive strategy to desensitise P50 to changes in plasma pH, and the significance of the blood respiratory properties is discussed in terms of the life style of C. porosus. Expand
Respiration in the fresh water turtle, Chelys fimbriata.
TLDR
The duration of voluntary breath holding appears related to Pao 2 and the subsequent dive was greatly shortened following a period of hypoxic breathing, suggesting adaptive value in economy of gas exchange and gas transport of Chelys fimbriata. Expand
Temperature-induced changes in blood acid-base status in the alligator, Alligator mississipiensis.
  • D. G. Davies
  • Chemistry, Medicine
  • Journal of applied physiology: respiratory, environmental and exercise physiology
  • 1978
TLDR
The data of the present study are consistent with the concept that poikilotherms regulate their alveolar ventilation with changes in body temperature in order to keep OH-/H+ or alpha-imidazole constant. Expand
...
1
2
3
4
5
...