BIOL 224 Lecture Notes - Lecture 3: Electroreception, Blood Sugar, Endocrine System
Document Summary
Lectures 3-4 unifying concepts in physiology and homeostasis lecture notes (ch. 32 pgs. 756-758, 766-772 biology: the diversity of life by peter russell) Key concept: surface area/volume ratio, some properties vary in relation to volume (measured as body mass) An animal is exchanging matter with its environment function of body size. Large animals are more efficient at maintaining internal body temperature due to lower sa/v ratio less heat loss. Large animals therefore require structural adaptations to improve exchange with the environment: other properties vary in relation to surface area. Small animals with simple body construction have enough surface area to meet the cells requirements (ex. hydra) Unifying concept: physiological phenotype is a combination of given genotype and the animals" environment: ex. Acclimation: an animals short term response change to its environment (applicable to nearly all species) May be used in response to predators. Phenotypic plasticity: removal of stress results in phenotype return to original shape.
