Trachea  - is a tube through which air travels down into lungs , Blood - carries oxygen to all body organs, Diaphragm - is a large muscle at tge base of ribs and helps in inhalation and exhalation, Lungs - are like balloons and they contain little sacs surrounded by blood vessels ,

Respiratory system g4

بواسطة
تضمين

لوحة الصدارة

النمط البصري

الخيارات

تبديل القالب

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