Important Terms
  • Bradycardia=Reduced heart rate

Bradycardia Graph

Bradycardia observed in a diving seal. Data adapted from R.S. Elsner (1998) by Erik Seedhouse.

  • Residual Volume=Air volume remaining in the lungs after exhaling as deep as possible.
  • Mammalian Diving Reflex=Physiologic responses to immersion that include (a) bradycardia, (b) decreased cardiac output, (c) lactate accumulation in under-perfused muscle, (d) increased peripheral vasoconstriction.
  • Diving Response or Mammalian Diving Reflex (MDR)=The mechanism controls the shift of blood to the brain and hear
  • Aerobic Dive Limit (ADL)=The longest dive that a marine mammal can make while relying principally on oxygen stored in the lungs, blood and muscles to maintain aerobic metabolism. 

Photo provided by Corel with permission


Fun Seal Facts
Important Terms
Diving Mammal Basics
Adaptations and Physiological Control
Possible Future Studies or Areas of Exploration
Literature Cited
External Links
Hot Topics in Animal Physiology

This website was created as a part of a class project in the
Animal Physiology Class at
Davidson College.

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