هو المركب الكيميائي الأهم في الإشارات العصبية في الجسم،حيث يتحرر في نهاية العصب ويؤثر في الخلية العصبية او العضلية الواجب التأثير عليها عبر نفاذه الى مستقبلات موجودة في غشاء الخلايا .
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