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Am J Physiol 202: 1163-1165, 1962;
0002-9513/62 $5.00
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Heart rate and blood lactic acid concentration during experimental diving of water snakes

H. V. Murdaugh JR. 1 and Joseph E. Jackson 1

1 Department of Medicine, University of Alabama School of Medicine; and Birmingham Veterans Administration Hospital, Birmingham, Alabama

Bradycardia in response to submersion occurs in Natrix sipedon and Natrix cyclopion. Atropine will prevent this diving bradycardia. Blood lactic acid concentration does not increase during submersion, indicating the presence of an arterial constrictor response in these species of water snake. The diving phenomenon of the water snake appears similar to the diving phenomenon of the seal in that both diving bradycardia and arterial constrictor response occur.

Submitted on October 20, 1961






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