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Explore the skeletal structure, the power of breathing, and the vital role of the heart in the human body. Learn how these systems work together to support life and energy levels.
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The Human Body By Alyrah
The skeleton • The adult body has 205 bones in it. • The skeleton supports your body.
The Respiratory system You breathefaster as you use more energy. Breathing in and out is called inhaling and exhaling.
The Circulatory system The circulatory system is your heart.