القائمة الرئيسية

الصفحات

الهيكل العظمي والعضلات.

12 فبراير 2017

تتألف العظام من خلايا حية، وأكبر عظام الجسد عظم الفخذ، ءءفأما ء أصغرها فعظم الركاب في الأذن تشكلالأضلاع قفثا لحماية الأضلاع و الرئتين و بالطرقة عينها تحمي الجمجمة الدماغ الطري و وعند ماتقى العظام يتكون مفصل .تتماسك المفاصل بالربطة المرنة ونسيج اللين يدعى الغضروف ، عندما يامر الدماغ العضلات بالتقلس بالعظام ، و هكذا نتحرك.

reaction:

تعليقات

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