[Campbell Biology P.945] In the context of animal thermoregulation, which pair of terms is c... | Practice Question

In the context of animal thermoregulation, which pair of terms is correctly defined and contrasted?

  • A: Endothermic: Primarily relies on external heat sources; Ectothermic: Generates most of its heat internally.
  • B: Poikilotherm: Maintains a relatively constant body temperature; Homeotherm: Body temperature varies with environmental temperature.
  • C: Endothermic: Warmed mostly by heat generated by metabolism; Ectothermic: Warmed mostly by heat from external sources.
  • D: Regulator: Allows internal variables to vary with external changes; Conformer: Controls internal variables within a narrow range.

Explanation

Endothermic animals generate most of their body heat internally through metabolic processes, while ectothermic animals primarily rely on external environmental sources for heat. This is a fundamental distinction in how animals regulate their body temperature. Poikilotherms have varying body temperatures, and homeotherms maintain relatively constant ones. Regulators control internal variables, while conformers allow them to vary.