Increases in arterial blood oxygen during exercise in the lemon shark (Negaprion brevirostris)

P. G. Bushnell, P. L. Lutz, J. F. Steffensen, A. Oikari, S. H. Gruber

Research output: Contribution to journalArticle

36 Citations (Scopus)

Abstract

Polyethylene cannulae were implanted in pre- and post-branchial blood vessels allowing nonstressful blood sampling over a variety of activity ranges in an active tropical elasmobranch, the lemon shark (Negaprion brevirostris). The P50 was found to be 11.8 Torr at 24°C and pH of 7.7. A Bohr shift of -0.36 was also found. Blood Po2 and oxygen content were measured during rest, routine swimming, and exercise in unanesthetized, free swimming juveniles. Under all conditions venous oxygen levels were low with venous Po2 of 7.1±2.7 Torr, and venous oxygen content ( {Mathematical expression}) of 0.56±0.4 vol%. However, a large variability was found in arterial blood measurements. Arterial Po2 ranged from 7 to 80 Torr, while arterial oxygen content (Cao2) varied from 1.6 vol% to 6.8 vol% among ten experimental animals. A significant increase in arterial Po2, oxygen content, and hematocrit was noted during increased activity. Since the venous system provides little or no oxygen reserve, increased oxygen extraction from the blood ( {Mathematical expression}) appears to be met by an increase in Cao2 rather than a decrease in {Mathematical expression}. Mechanisms to accomplish this may include increasing hematocrit and vacular gill shunts.

Original languageEnglish
Pages (from-to)41-47
Number of pages7
JournalJournal of Comparative Physiology ■ B
Volume147
Issue number1
DOIs
StatePublished - Mar 1 1982

Fingerprint

Negaprion brevirostris
Sharks
shark
exercise
Blood
blood
Oxygen
oxygen
Hematocrit
hematocrit
Elasmobranchii
vessel
blood sampling
Blood vessels
Polyethylene
cannulas
blood vessels
polyethylene
laboratory animals
Blood Vessels

ASJC Scopus subject areas

  • Physiology (medical)
  • Environmental Science(all)
  • Physiology
  • Animal Science and Zoology

Cite this

Increases in arterial blood oxygen during exercise in the lemon shark (Negaprion brevirostris). / Bushnell, P. G.; Lutz, P. L.; Steffensen, J. F.; Oikari, A.; Gruber, S. H.

In: Journal of Comparative Physiology ■ B, Vol. 147, No. 1, 01.03.1982, p. 41-47.

Research output: Contribution to journalArticle

Bushnell, P. G. ; Lutz, P. L. ; Steffensen, J. F. ; Oikari, A. ; Gruber, S. H. / Increases in arterial blood oxygen during exercise in the lemon shark (Negaprion brevirostris). In: Journal of Comparative Physiology ■ B. 1982 ; Vol. 147, No. 1. pp. 41-47.
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