BIOL 1011 Lecture Notes - Vasoconstriction, Body Fluid, Vasodilation

• School: Dalhousie University
• Department: Biology
• Course: BIOL 1011
• Professor: Marty Leonard

Document Summary

Internal body temp. stays constant regardless of changes in external temperature. Maintain body temp in range that allows cells to function effectively: metabolism will decrease with a decrease in body temperature, hemoglobin would not bind to o2 as well. Ectotherms: depend on environment for heat b. Internal temp can vary because of these: usually insects, fish, amphibians and reptiles, some ectotherms have stable internal temp because the place where they lives" temp does not vary a lot, i. e. the bottom of the ocean. Endotherm: gain most of heat metabolically, birds, humans/mammals, considered to keep body temp at a narrow range, can still gain heat from environment as well (a lot of overlap to these categories) Temperature regulation (ectotherm: radiation from sun, conduction of heat from rock, to cool down convection from breeze, open its mouth, allows for evaporation of water, constrict cells at surface to reduce heat loss.