books على ماذا يعتمد التنفس
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Source: mawdoo3.com
على ماذا يعتمد التنفس (Info)
يعتمد التنفس الطبيعي على استنشاق الهواء بالشهيق، وإخراجه بالزفير عن طريق الرئتين اللتان تتحركان صعوداً وهبوطاً على التوالي، وهذه العمليات جميعاً لا يمتلكها الجنين لكنه تحت قيد نمو هذه الجزئية كباقي الجزئيات، ويعد الحبل السري والمشيمة اللذان يربطان الأم بجنينها أهم وسائل المساعدة التي تساهم في عملية التنفس لهذا الجنين.
