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ectotherm ecÂ·toÂ·therm (Äk'tÉ-thÃ»rm') n. An organism that regulates its body temperature largely by exchanging heat with its surroundings; a poikilotherm.
What are humans? Endothermic means mammals produce heat through organelles called mitochondria. Homeothermic is when mammals regulate their body temperature, keep it constant. Ectothermic means they get energy from the environment. Humans are both endothermic and homeothermic.