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بعد دراسة ابن النّفيس لمسار الدّم في العروق وسريانه في الجّسم، استطاع أن يصف الدّورة الدّمويّة بدقّة، وقد كان بذلك أول مُكتشف للدّورة الدّمويّة في التّاريخ، أي أنّه سبق العالم سيرفيتوس الإسباني، وهارفي الإنجليزي بثلاثة قرون.
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