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Regional distribution of blood flow in the bat (Myotis lucifugus) during arousal from hibernation.

The distribution of injected 86Rb was used to assess the relative blood flow rates of various organs and tissues of bats during arousal from hibernation. Blood flow rates during arousal were 11.7 times greater than the control, non-arousal rates in brown fat, and 3.3 times greater in anterior muscle. Such large blood flow changes in these tissues testify to their specialized role in arousal thermogenesis. Relative blood flow to the liver, kidneys, and gastrointestinal tissues was greatly reduced during arousal.