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Birds presentation

Comparative Physiology-Birds/exam3

QuestionAnswer
phenotypic flexibility reversible, temporary adjustments of phenotype to prevailing environmental or ecological demands
benefits of phenotypic flexibility better match physiology to current conditions, resulting in increased fitness
difference between BMR and summit MR BMR= minimum maintenance MR Summit MR= max MR in cold
Msum and cold tolerance are ____________ correlated positively
physiological adjustments underlie seasonal phenotypes? 1. organismal-MRs, cold tolerance, therm conductance 2. organ-hypertrophy, fuel delivery 3. tissue-mitochondria, lipid droplets, depot fat 4. cellular/molecular- oxidative capacity, substrate transport, gene/protein expression
what are the two potential mechanisms of seasonal phenotypic flexibility in Msum 1. enhanced cellular aerobic capacity- possibly coupled to changes in substrate or oxygen delivery pathways 2. larger muscles
Created by: rusulali97