Jump to ContentJump to Main Navigation
Diving Seals and Meditating YogisStrategic Metabolic Retreats$
Users without a subscription are not able to see the full content.

Robert Elsner

Print publication date: 2015

Print ISBN-13: 9780226246710

Published to Chicago Scholarship Online: January 2016

DOI: 10.7208/chicago/9780226247045.001.0001

Show Summary Details
Page of

PRINTED FROM CHICAGO SCHOLARSHIP ONLINE (www.chicago.universitypressscholarship.com). (c) Copyright University of Chicago Press, 2021. All Rights Reserved. An individual user may print out a PDF of a single chapter of a monograph in CHSO for personal use.date: 24 October 2021

Regulatory mechanisms in the seal’s dives

Regulatory mechanisms in the seal’s dives

(p.75) 5 Regulatory mechanisms in the seal’s dives
Diving Seals and Meditating Yogis

Robert Elsner

University of Chicago Press

This chapter focuses on the regulatory mechanisms of diving seals. Frequent dives demand exquisite timing of mechanisms that regulate respiration and circulation; long sustained immersions result in metabolic depression. Continued functioning of the seal's heart when its blood-borne oxygen decreases, as the dive lengthens, depends on its enhanced capacity for reliance upon anaerobic energy sources, a capability generally greater than that of nondiving mammals. Increasing cardiac production of lactate that occurs as the dive progresses is a product of the conversion to anaerobic metabolic processes, and is supported by the seal heart muscle's unusually high glycogen content, a resource exceeding that of terrestrial mammal (dog or pig) hearts. The ensuing decline in blood oxygen, and increasing carbon dioxide and acid products of metabolism further activate signals originating in neural chemoreceptor organs perfused by arterial blood.

Keywords:   regulatory mechanisms, diving seals, metabolic depression, anaerobic energy sources, lactate, anaerobic metabolic processes, glycogen, neural chemoreceptor organs, arterial blood

Chicago Scholarship Online requires a subscription or purchase to access the full text of books within the service. Public users can however freely search the site and view the abstracts and keywords for each book and chapter.

Please, subscribe or login to access full text content.

If you think you should have access to this title, please contact your librarian.

To troubleshoot, please check our FAQs, and if you can't find the answer there, please contact us.