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    PubMed
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    最近的一位心脏手术患者成功地忍受了模拟太空飞行的G力,但经历了胸部疼痛. 这一案例强调了需要对先前心脏手术的太空飞行参与者进行仔细的医疗评估.

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    The human heart is a complex organ with an intricate system of valves that regulate blood flow. There are two main types of valves: atrioventricular (AV) valves and semilunar valves.
    The AV valves prevent the backflow of blood from the ventricles to the atria during ventricular contraction. These valves function with the assistance of the chordae tendineae and papillary muscles. When the ventricles are relaxed, the chordae tendineae are slack, allowing blood to flow from the atria into the...