Cardiac reflex
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In a broad sense, it refers to reflex changes in cardiac function in response to stimuli applied to receptors in various parts of the body or changes in mental state. In particular, changes in heart rate are often seen as a cardiac function. Cardiac reflexes seen in daily life include the regulation of heart rate by changes in cardiac sympathetic and vagus nerve activity caused by changes in arterial blood pressure, venous return, and oxygen and carbon dioxide concentrations in the blood that occur during various activities via baroreceptors and chemoreceptors. In addition, the heart rate is reflexively suppressed in response to pain and cold stimuli as somatosensory receptors. Source: Heibonsha World Encyclopedia, 2nd Edition Information |
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広い意味では，身体の各部の受容器に加えられた刺激や精神状態の変化に応答して，心臓機能が反射性に変動する場合をいう。とくに心臓機能として心拍数の変動をみることが多い。日常生活にみられる心臓反射としては，各種行動時に起こる動脈血圧，静脈環流，血中の酸素や炭酸ガス濃度の変動が血圧受容器や化学受容器を介して心臓交感･迷走神経活動を変化させることによる心拍数の調節がある。その他，体性感覚受容器として痛覚や冷覚刺激に対して反射性に心拍数は抑制される。
出典 株式会社平凡社世界大百科事典 第２版について 情報 |
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