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The cardiovascular system operates through two primary phases: diastole, when blood fills the heart, and systole, when the heart contracts to pump blood throughout the body.

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Heart Rate Sensors and Sleep Wearables

  • 章节

  • 发表日期：

    2026年

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  • Michael A. Grandner,
  • Kathryn E. R. Kennedy

摘要

The cardiovascular system operates through two primary phases: diastole, when blood fills the heart, and systole, when the heart contracts to pump blood throughout the body.