…The heart acts as a pump for the circulatory system, pumping blood continuously and rhythmically. The amount of blood output per beat is called stroke volume, and the product of this and the heart rate is the amount of blood output per minute, or cardiac output. To eliminate individual differences resulting from differences in body size and shape, cardiac index is calculated by dividing cardiac output by body surface area. … From [Cardiac Output]…The heart pumps blood into the arteries by periodically contracting, and this pumping function is expressed as the amount of blood pumped per minute, which is called the cardiac output or minute cardiac output. Therefore, cardiac output (ml/min) is determined by the product of the amount of blood pumped with one contraction (stroke volume) and the number of contractions per minute (heart rate). In general, cardiac output increases with an increase in heart volume from small animals to large animals, or from children to adults, but this is due to an increase in stroke volume, and the heart rate actually decreases. … *Some of the terms mentioned in the description of "stroke volume" are listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…心臓は循環系のポンプとしてたえ間なく律動的に血液を拍出しつづける。1回の拍動当りの拍出量は1回拍出量stroke volumeであり,これと心拍数の積が毎分当りの拍出量,心拍出量cardiac outputである。身体の大きさや形の差から生ずる個人差を除くために,心拍出量を体表面積で除したものが心係数である。… 【心拍出量】より…心臓は周期的に収縮を繰り返すことによって血液を動脈へ拍出するポンプ機能をもつが,このポンプ機能は1分間に拍出する血液量で表され,それを心拍出量あるいは毎分心拍出量と呼ぶ。したがって心拍出量(ml/分)は,1回の収縮で拍出する量(1回拍出量)と1分間に収縮する回数(心拍数)の積によって決定される。一般に心拍出量は,小動物から大動物へ,あるいは子どもから大人へ移行するにしたがい,心臓容積の増加に伴い増大するが,これは1回拍出量の増加によるもので,心拍数はむしろ減少する。… ※「1回拍出量」について言及している用語解説の一部を掲載しています。 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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