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Message definition (Blood ) Blood is circulated around the body through [[blood vessel]]s by the pumping action of the [[heart]]. In animals with [[lung]]s, [[artery|arterial]] blood carries oxygen from inhaled air to the tissues of the body, and [[vein|venous]] blood carries carbon dioxide, a waste product of [[metabolism]] produced by cells, from the tissues to the lungs to be exhaled. Blood is bright red when its hemoglobin is oxygenated and dark red when it is [[Deoxygenated hemoglobin|deoxygenated]].
血液は心臓 のポンプ作用によって血管 を通って全身を循環する。肺 を持つ動物では、動脈 血液は吸入した空気から体内の組織に酸素を運び、静脈 血液は細胞から産生される代謝 の老廃物である二酸化炭素を組織から肺に運び、吐き出す。血液は、ヘモグロビンが酸素化されると鮮やかな赤色になり、脱酸素化 されると暗赤色になる。