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Related Experiment Videos

The source of circulating catecholamines in forced dived ducks.

A M Lacombe1, D R Jones

  • 1Department of Zoology, University of British Columbia, Vancouver, Canada.

General and Comparative Endocrinology
|October 1, 1990
PubMed
Summary

During forced dives, adrenal glands supply most epinephrine and norepinephrine. Cardiovascular adjustments in ducks during dives are unaffected by plasma catecholamine levels, regardless of adrenal gland function.

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Area of Science:

  • Physiology
  • Neuroendocrinology

Background:

  • Plasma catecholamines, including epinephrine and norepinephrine, play crucial roles in physiological responses to stress.
  • The adrenal glands and sympathetic nervous system are primary sources of circulating catecholamines.

Purpose of the Study:

  • To determine the origin of plasma catecholamines during diving in ducks.
  • To investigate the role of adrenal catecholamines in cardiovascular adjustments during forced submergence.

Main Methods:

  • Measurements of plasma catecholamines in adrenalectomized (ADX) and adrenal-denervated (DNX) ducks and their sham-operated controls (SH-adx, SH-dnx).
  • Assessment of cardiovascular parameters (heart rate, arterial blood pressure) during 3-minute forced dives.

Main Results:

Related Experiment Videos

  • Adrenal glands accounted for 100% of plasma epinephrine and 70-80% of norepinephrine release during dives.
  • 20-30% of plasma norepinephrine originated from sympathetic nerve endings.
  • Adrenal catecholamine release was solely dependent on nerve activation.
  • Cardiovascular adjustments during diving were not influenced by variations in plasma catecholamine levels.

Conclusions:

  • Adrenal glands are the predominant source of epinephrine and a major source of norepinephrine during diving in ducks.
  • While sympathetic nerves contribute to norepinephrine release, adrenal catecholamines do not significantly modulate cardiovascular responses during short forced dives in this species.