Abstract
Abstract 1. In 25° C-acclimated winter frogs which were transferred to 5°C, the basal metabolic rate was significantly increased one day and the metabolic response to adrenaline two days after the transfer. 2. The blood sugar level decreased, following a small initial rise, after 4 days of cold exposure. The hyperglycaemic response to adrenaline was significant by the 4th day. 3. The basic heart rate fell between the 2nd and 4th days, but the chronotropic sensitivity to adrenaline within the two first days fell to the level typical for frogs acclimated to 5°C. 4. A significant activation of the thyroid, as judged from its histological state, was observable within 4 days of cold exposure. 5. It is concluded that the thyroid hormone may be important in regulating the responsiveness to catecholamines in amphibians.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
