Hill R W, Veghte J H
Science. 1976 Oct 22;194(4263):436-8. doi: 10.1126/science.982027.
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.
在1.4摄氏度至24摄氏度的环境温度下，耳廓的血流量会减少，这将耳廓的热量损失降至最低，并使竖起的耳廓表面接近环境温度。当环境温度比体温低1摄氏度至9摄氏度时，一些动物的耳廓会通过稳定或搏动性血管舒张来升温，这种反应有利于热量散失。当环境温度超过体温4摄氏度至5摄氏度时，耳廓会循环流动比环境温度更低的血液；这种反应有利于热量流入。
