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ectothermic

   Also found in: Dictionary/thesaurus, Legal, Encyclopedia, Wikipedia, Hutchinson 0.01 sec.
ectothermic (kt-thûrmk) or ec·to·ther·mal (-ml) or ec·to·ther·mous (-ms)
adj.
Of or relating to an organism that regulates its body temperature largely by exchanging heat with its surrounding environment.


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Although neutralizing antibody circulation is only one part of immune function, previous studies have suggested that multiple aspects of the ectothermic immune system may be affected by body temperature, which is directly affected by environmental temperature (29-31).
Like all reptiles (backboned-animals with scaly skin), it's ectothermic, relying on external heat sources to maintain body temperature.
Since snakes are cold-blooded, or ectothermic, external sources--sunlight, air, water, or warm blacktop roads--heat their bodies.
 
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