Abstract
1. 1. Isolated hearts from neonatal (<48hr) rats ceased contractility at 4.5 C while those from 21–30 days old stopped beating at 10 C. 2. 2. Heart rate-temperature data analyzed by Arrhenius plots and Q 4 determinations demonstrated that hearts from neonates respond in a manner approaching that of hearts from hibernators, while the response from the 21–30 day olds was more typical of hearts from adult, non-hibernators.
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