PHGY 312 Lecture Notes - Lecture 8: Thermodynamic Activity, Regulation Q, Torpor
24 May 2016
School
Department
Course
Professor
Document Summary
What keeps metabolic rate going? o o o. Oxygen consumption is an indication of the speed of the reaction. Q10: for 10 degree difference in temperature, you get a doubling in speed. Values lower than 2 means there is some form of regulation. Q = sp" /sp"" ^(10/t"-t""), sp"", t"" is the point of lower temp/speed. Behavioural control = running, eating, changes in posture. Maintain body temperature around a target value over a range of ambient temperatures. Factors that influence bt: circadian, fever, exercise, sleep, hibernation, torpor (hibernation) Oscillations in body temp are higher in smaller species. We lose wakefulness drive to breathe when sleeping. Arterial pco2 and bt is fairly constant among species. How this is done among species varies greatly: Body temp depends on heat loss (-) and heat production (+) Body temp is regulated because heat loss and production are not linked to one o o o o o o o another o.
