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YouTubeخلف الحقيقة
Mars humans vs Moon humans vs Earth humans 🚀 #space #evolution #comparison
ماذا لو عاش الإنسان ملايين السنين على كواكب مختلفة؟ كيف سيتغير شكله على القمر؟ ولماذا ستكبر رئتاه على المريخ؟ وكيف يمكن أن يبدو على زحل أو حتى على الشمس؟ في هذا الفيديو نستكشف كيف يمكن ...
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Here's exactly what happens every time your heart beats 🫀 It starts with an electrical signal from the SA node — your heart's natural pacemaker. That signal tells your atria to contract, pushing blood down into the ventricles. Then the ventricles contract (ventricular systole): 🫀 Right ventricle → pumps deoxygenated blood to the lungs 🫀 Left ventricle → pumps oxygen-rich blood to the rest of your body After that, the heart enters diastole — a brief relaxation where the chambers refill and pre
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Here's exactly what happens every time your heart beats 🫀 It starts with an electrical signal from the SA node — your heart's natural pacemaker. That signal tells your atria to contract, pushing blood down into the ventricles. Then the ventricles contract (ventricular systole): 🫀 Right ventricle → pumps deoxygenated blood to the lungs 🫀 Left ventricle → pumps oxygen-rich blood to the rest of your body After that, the heart enters diastole — a brief relaxation where the chambers refill and pre
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