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从 0 到 4:解密让心脏跳动的“底层代码”.

  • 2026-02-07 08:24:13
从 0 到 4:解密让心脏跳动的“底层代码”.
你的心脏为什么会自动跳？因为它自带电池和电线。
要学好心血管生理，必须翻过“心室肌动作电位”这座大山。
别被那根复杂的曲线吓倒，它只有5个阶段：
  • 0 期（去极化）：Na+ 内流。像百米冲刺，电位瞬间飙升。（快钠通道）。
  • 1 期（初期复极）：K+ 外流。冲太猛了，稍微回落。
  • 2 期（平台期）：Ca2+ 内流，K+ 外流。
  • 这是核心！ 钙进钾出，相互抵消，电位维持平衡。
  • 因为有了平台期，心脏才不会像手部肌肉那样发生“强直收缩”。它必须跳一下，歇一下。
  • 3 期（末期复极）：K+ 快速外流。回归平静。
  • 4 期（静息期）： 恢复离子平衡。
【洞见时刻】
秒杀考点：
  • 0 期靠什么？Na+。
  • 2 期平台期靠什么？Ca2+。
  • 谁决定了心肌不会抽筋？有效不应期特别长（也就是2期特别长）。
心脏之所以不知疲倦，是因为它懂得在每次跳动后，进行“漫长的等待”。
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  1. CONNECT:[ UseTime:0.000924s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001495s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.001599s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.004321s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001297s ]
  6. SELECT * FROM `set` [ RunTime:0.002465s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001507s ]
  8. SELECT * FROM `article` WHERE `id` = 467462 LIMIT 1 [ RunTime:0.006478s ]
  9. UPDATE `article` SET `lasttime` = 1770478893 WHERE `id` = 467462 [ RunTime:0.014437s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000741s ]
  11. SELECT * FROM `article` WHERE `id` < 467462 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.010390s ]
  12. SELECT * FROM `article` WHERE `id` > 467462 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.011340s ]
  13. SELECT * FROM `article` WHERE `id` < 467462 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.016655s ]
  14. SELECT * FROM `article` WHERE `id` < 467462 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.020934s ]
  15. SELECT * FROM `article` WHERE `id` < 467462 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.018484s ]
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