BIOL 3070 Lecture 19: Lecture 19 - AP
Document Summary
Recap (slide 15: low conductivity = good insulator, high thermal conductivity = exchanges heat with env"t more readilty. Sig. lower than what it normally is: seen a lot in birds, at 20degrees(top), 0, and -20, at 20, ambient temp see some decrease in body temps during evening (as. 3 strategies used by ectothermic animals in cold env"ts to avoid this. Freeze-tolerance: animals cope with some degree of ice crystal formation within bodies. Water in icf can interact with macromolecules and can remain unfrozen (although ecf frozen, most icf remains liquid) Plasma and icf has more proteins dissolved in it compared to interstitial fluid (so things take longer to freeze in the plasma!) Supercooling: liquid cooled below freezing point without solidification! Degree of supercooling mirrors temp (inverse proportional to evn"t temp) Antifreezes: lowers freezing point of the ecf (functions as cryoprotectant - substance that is used to protect biological tissue from freezing damage due to ice formation)
