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Related Experiment Videos

Diving responses in ducks after acute barodenervation.

D R Jones, W K Milsom, F M Smith

    The American Journal of Physiology
    |August 1, 1983
    PubMed
    Summary

    The diving response in ducks primarily occurs independently of systemic arterial baroreceptors. While these receptors influence heart rate during dives, their role in cardiovascular adjustments is less significant than previously thought.

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    Area of Science:

    • Cardiovascular Physiology
    • Comparative Physiology
    • Diving Reflex

    Background:

    • Systemic arterial baroreceptors are crucial for regulating blood pressure and heart rate.
    • The diving reflex involves significant cardiovascular adjustments, including bradycardia and peripheral vasoconstriction.

    Purpose of the Study:

    • To investigate the specific contribution of systemic arterial baroreceptors to the cardiovascular adjustments observed during diving in ducks.
    • To determine whether the diving response is dependent on baroreceptor integrity.

    Main Methods:

    • Experiments were conducted on unanesthetized ducks with acute baroreceptor denervation.
    • Cardiovascular responses, including heart rate and hindlimb vascular resistance, were monitored during diving.
    • Pharmacological and electrical stimulation of baroreceptor nerves were employed.

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    Main Results:

    • Both intact and denervated ducks exhibited bradycardia during diving, though it was less pronounced in denervated animals.
    • Hindlimb vascular resistance significantly increased in both groups.
    • Baroreceptor stimulation influenced cardiac control but had a diminished effect on peripheral resistance during prolonged dives.

    Conclusions:

    • The majority of the diving response in ducks is independent of baroreceptor integrity.
    • A barostatic reflex active during dives primarily affects cardiac control, not total peripheral resistance.