Arterial Constrictor Response in a Diving Mammal

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Science  22 Apr 1966:
Vol. 152, Issue 3721, pp. 540-543
DOI: 10.1126/science.152.3721.540


Angiograms were obtained in the harbor seal, Phoca vitulina, in air and during diving. During diving there is arterial constriction of the vascular beds of muscle, skin, kidney, liver, spleen, and presumably of all vascular beds except those perfusing the brain and heart. There is sudden constriction and narrowing of muscular arteries close to their origin from the aorta. Constriction of small arterial branches is so intense that blood flow is essentially lost in all involved organs.