Note to users. If you're seeing this message, it means that your browser cannot find this page's style/presentation instructions -- or possibly that you are using a browser that does not support current Web standards. Find out more about why this message is appearing, and what you can do to make your experience of our site the best it can be.

Science 22 October 1976:
Vol. 194. no. 4263, pp. 436 - 438
DOI: 10.1126/science.982027
Prev | Table of Contents | Next

Articles

Science, Vol 194, Issue 4263, 436-438
Copyright © 1976 by American Association for the Advancement of Science

articles

Jackrabbit ears: surface temperatures and vascular responses

RW Hill and JH Veghte

Blood flow to the ear pinnae is curtailed at ambient temperatures of between 1.4 degrees and 24 degrees C, which minimizes heat loss across the pinnae and allows the surfaces of erect pinnae to approach ambient temperature. The pinnae are warmed by steady or pulsatile vasodilation in some animals when the ambient temperature is between 1 degree and 9 degrees C below body temperature, a response favoring heat loss. When ambient temperature exceeds body temperature by 4 degrees to 5 degrees C, the pinnae are circulated with blood cooler than ambient temperature; this response favors heat influx.


THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
The imaging properties and sensitivity of the facial pits of pitvipers as determined by optical and heat-transfer analysis.
G. S. Bakken and A. R. Krochmal (2007)
J. Exp. Biol. 210, 2801-2810
   Abstract »    Full Text »    PDF »


To Advertise     Find Products

Science. ISSN 0036-8075 (print), 1095-9203 (online)