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Record Details

Record 36 of 523
Tolerance of snakes to hypergravity
Author and Affiliation:
Lillywhite, H. B.(NASA Ames Research Center, Moffett Field CA United States)
Ballard, R. E.
Hargens, A. R.
Abstract: Sensitivity of carotid blood flow to increased gravitational force acting in the head-to-tail direction(+Gz) was studied in diverse species of snakes hypothesized to show adaptive variation of response. Tolerance to increased gravity was measured red as the maximum graded acceleration force at which carotid blood flow ceased and was shown to vary according to gravitational adaptation of species defined by their ecology and behavior. Multiple regression analysis showed that gravitational habitat, but not body length, had a significant effect on Gz tolerance. At the extremes, carotid blood flow decreased in response to increasing G force and approached zero near +1 Gz in aquatic and ground-dwelling species, whereas in climbing species carotid flow was maintained at forces in excess of +2 Gz. Tolerant (arboreal) species were able to withstand hypergravic forces of +2 to +3 Gz for periods up to 1 h without cessation of carotid blood flow or loss of body movement and tongue flicking. Data suggest that the relatively tight skin characteristic of tolerant species provides a natural antigravity suit and is of prime importance in counteracting Gz stress on blood circulation.
Publication Date: Mar 01, 1996
Document ID:
20040089492
(Acquired Sep 07, 2004)
Subject Category: LIFE SCIENCES (GENERAL)
Document Type: Journal Article
Publication Information: Physiological zoology (ISSN 0031-935X); Volume 69; 2; 293-303
Publisher Information: United States
Financial Sponsor: NASA Ames Research Center; Moffett Field CA United States
Description: In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: Copyright
NASA Terms: ADAPTATION; ARTERIES; HIGH GRAVITY ENVIRONMENTS; SNAKES; ACCELERATION; BLOOD FLOW; CARDIOVASCULAR SYSTEM; CLASSIFICATIONS; FLOW VELOCITY; GRAVITATION; HEART FUNCTION; HEART RATE
Other Descriptors: ADAPTATION, PHYSIOLOGICAL; CAROTID ARTERIES/PHYSIOLOGY; HYPERGRAVITY; SNAKES/ANATOMY & HISTOLOGY/CLASSIFICATION/PHYSIOLOGY; ACCELERATION; ANIMALS; BLOOD FLOW VELOCITY; BOIDAE; CARDIOVASCULAR PHYSIOLOGY; COLUBRIDAE; COMPARATIVE STUDY; GRAVITATION; HEART RATE; REGIONAL BLOOD FLOW; SUPPORT, NON-U.S. GOV'T; SUPPORT, U.S. GOV'T, NON-P.H.S; NASA CENTER ARC; NASA DISCIPLINE CARDIOPULMONARY
Availability Source: Other Sources
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