When you decide to go for a run, your brain sends signals through the ____ system to tell your body to start moving. Your ____ system provides support and structure so your body can stand and move. The ____ system moves your bones by contracting and relaxing to make your legs and arms move. As your muscles work harder, they need more oxygen. The ____ system brings oxygen into your lungs, and the ____ system carries that oxygen through your blood to your working muscles. To give your muscles energy, the ____ system breaks down food into nutrients that your body uses for fuel. All of these systems work together to help you move, breathe, and stay energized while you run! To throw a ball, your body relies on many systems working together. Your muscular system uses ____ that contract and relax to move your arm. Those muscles pull on your ____ from the skeletal system, which gives your arm shape and support. The circulatory system uses your ____ to pump oxygen and nutrients to your working muscles. That oxygen comes from the respiratory system, which brings air into your ____. The digestive system provides energy for your movement by breaking down food in your ____. Finally, your nervous system sends messages to your ____ to coordinate each movement and make sure you release the ball at the right time. All these organs and systems must work together for you to aim, throw, and follow through successfully!

Systems Working Together

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