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心臟收縮又稱收縮期（英語：Systole，/ˈsɪstəli/，SIST-ə-lee）是心動周期中的一個環節，當心室內血液充滿後，心室內的血液會射入動脈，這一過程就叫心臟收縮 [1][2]。心臟收縮的基礎是心肌的收縮性完好。[3]
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