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1.  The heart is a part of the circulatory system.The heart pumps blood to the entire body.The blood brings oxygen in to the body cells.Once your cells receive and your heart pumps it out again.It is located in your chest.

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The brain is a part of the nervous system.Recording to the brain"It works with the spinal cord and the nerves.They work together to control,balance,and keep the body mind,and emotions in order.It controls your body.It is in your head."

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The lungs are a part of the respiratory system. It breathes air to your mouth and your nose. According to  My Lungs "your  diaphragm muscle helps, too. It's like this bottom balloon in my model.The diaphragm moves down and then your lungs can take in air."It is in your rib cage.

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The muscles is a part of the muscular system.It helps you stand up. It is every where.

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The stomach is a part of the digestive system.It gives you energy.The stomach
breaks it in to forms.It breaks it in to small pice.It is in the middle.

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The bones is a part of the skeletal system.It helps you not to lean down.It is every where in your body.