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Related Experiment Videos

The coronary circulation: a fish perspective

M Axelsson1

  • 1Department of Zoophysiology, Göteborg University, Sweden. m.axelsson@zool.gu.se

Brazilian Journal of Medical and Biological Research = Revista Brasileira De Pesquisas Medicas E Biologicas
|November 1, 1995
PubMed
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Fish hearts have a coronary system, with its use varying by species activity level. Coronary blood flow, crucial for heart muscle, is regulated by nerves and hormones, similar to mammals.

Area of Science:

  • Cardiovascular Physiology
  • Comparative Anatomy
  • Fish Biology

Background:

  • A well-developed coronary system is present in elasmobranchs and some teleosts.
  • Coronary system utilization varies significantly between fish species, correlating with activity levels.
  • Research on fish coronary circulation control has historically relied on in situ/in vitro studies, with limited in vivo data.

Purpose of the Study:

  • To investigate the characteristics and control mechanisms of coronary circulation in fish.
  • To compare fish coronary circulation to mammalian systems.
  • To understand the factors influencing coronary blood flow regulation in fish.

Main Methods:

  • In vivo studies on salmonids to measure coronary blood flow.
  • Analysis of factors affecting coronary vascular resistance.

Related Experiment Videos

  • Investigation of neuronal and humoral control components.

    • Main Results:

    • In salmonids, approximately 1% of cardiac output supplies the compact myocardium via the coronary circulation.
    • Coronary blood flow is reduced by cardiac mechanical work, with peak flow during diastole, mirroring mammalian patterns.
    • Regulation of coronary vascular resistance involves neuronal (alpha- and beta-adrenoceptors) and humoral factors, including cholinergic vasodilation, ATP, ADP, prostaglandins, and local metabolites.

    Conclusions:

    • Fish coronary circulation exhibits functional similarities to mammals.
    • Both intrinsic (local metabolites) and extrinsic (neuronal, humoral) factors regulate coronary vascular resistance in fish.
    • Activity level is a key determinant of coronary system dependence in fish.