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Animals at the extremes: hibernation and torpor
Animals at the extremes: hibernation and torpor

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Changes in hypothalamic temperature and (b) metabolic responses of a hibernating eastern chipmunk (Tamias striatus), with a body temperature of 4.2C, to stepwise cooling of the POAH. Cooling of the POAH to about 2.1C (temperature alarm) precipitated arousal, but earlier steps produced no effect. Warming the POAH (indicated by the arrow in (a)) at the start of arousal suppressed it within 20 minutes or so
Figure 38 (a) Changes in hypothalamic temperature and (b) metabolic responses of a hibernating eastern chipmunk (Tamias striatus), with a T b of 4.2° C, to stepwise cooling of the POAH (T hy). Cooling of the POAH to about 2.1° C (T alarm) precipitated arousal, but earlier steps produced no effect. Warming the POAH (indicated by the arrow in (a)) at the start of arousal suppressed it within 20 minutes or so

 6.2 The hypothalamus as central regulator