Summary
The nature of the cardiovascular adjustments to forced and voluntary submergence in diving birds is described. In voluntary diving supra-bulbar nervous structures clearly play a role in modifying the responses observed during forced submergence. In forced submergence, bradycardia and increased peripheral resistance (PR) are reflexly maintained by stimulation of cardiovascular receptors. Whether carotid body chemoreceptors cause an increase in peripheral resistance has not been demonstrated, but they play a predominant role in maintaining bradycardia. Arterial baroreceptors have effects on both heart rate (HR) and PR in a dive, balancing cardiac output and resistance so that arterial blood pressure (BP) is maintained.
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Jones, D.R., West, N.H. (1978). The Contribution of Arterial Chemoreceptors and Baroreceptors to Diving Reflexes in Birds. In: Piiper, J. (eds) Respiratory Function in Birds, Adult and Embryonic. Proceedings in Life Sciences. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-66894-4_13
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DOI: https://doi.org/10.1007/978-3-642-66894-4_13
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