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اثر المواد الكيميائية المسرطنة في انقسام الخلايا وتكاثرها سؤال من أسئلة علوم ثالث المتوسط الفصل الثاني

نرحب بكم في موقع سعودي ميكس ونود أن نقوم بخدمتكم علي أفضل وجه ونسعي الي توفير حلول كافة الأسئلة التي تطرحوها من أجل أن نساعدكم في النجاح والتفوق، ولذلك نقدم لكم حل سؤال

اثر المواد الكيميائية المسرطنة في انقسام الخلايا وتكاثرها؟

والاجابة الصحيحة عن السؤال هي

يتألف جسم الإنسان البالغ من مئات البلايين من الخلايا. وفي كل دقيقة، تَموت عدة بلايين من هذه الخلايا ويستعاض عنها بعدة بلايين أخرى من خلايا جديدة. وتنشأ الخلايا الجديدة بالانقسام، حيث تنقسم الخلية إلى خليتين متماثلتين، تَتَضاعف كل منها وتُصْبح عندئذ قابلة للانقسام. وبهذه الطريقة، فإن الخلايا الجديدة المتَكوَّنة تأخذ مكان الخلايا الميتة. وتنقسم الخلايا الطبيعية عند وصول الإشارات الكيميائية إلى الحمض النووي الريبي منقوص الأكسجين في النواة. وتنتج الخلايا تماماً بنفس المعدَّل المطلوب لتَحل مكان الخلايا الميتة، وليس أبدًا بمعدَّل أسرع. 

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مرحبًا بك في موقع العرب ، حيث يمكنك طرح الأسئلة وانتظار الإجابة عليها من المستخدمين الآخرين.
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