Warm-blooded animals

Japanese: 定温動物 - ていおんどうぶつ

Also known as homeotherms or warm-blooded animals. An animal that maintains a constant body temperature regardless of outside temperature or activity, and includes only the two classes birds and mammals. The body is heated by muscular activity as the main heat source, and cooled by heat loss from the respiratory system and the body surface, but this is automatically regulated by a thermoregulatory mechanism consisting of thermoreceptors and the nervous and hormonal systems. However, some animals hibernate because it becomes difficult to maintain body temperature in extreme cold or when there is a food shortage. In recent years, there has been a theory that extinct dinosaurs were warm-blooded, but there is no definite proof. → Cold-blooded animals → Related topics Body temperature

Source : Heibonsha Encyclopedia About MyPedia Information

Japanese:

恒温動物，温血動物とも。外気温や活動に無関係に体温を一定に保持する動物のことで，鳥類・哺乳(ほにゅう)類の２綱のみが入る。体は筋活動を主要な熱源として加温され，呼吸器や体表からの放熱により冷却されるが，温度受容器や神経系・ホルモン系からなる温度調節機構が自動調節に当たっている。ただし，極端な寒さや食物不足の際には体温の維持が困難になるため冬眠するものもある。近年絶滅した恐竜が温血であったという説が出されているが確証はない。→変温動物
→関連項目体温

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