System - A group of things or parts that work together., Blood - The red liquid inside your body., Veins - The small tubes in your body that carry blood to the heart., Heart - The part of the body that makes blood go around inside., Arteries - The tubes in your body that carry blood away from your heart to other parts of the body., Capillary - The smallest tubes in your body that carry blood., Lungs - The two parts inside your body that you use for breathing., Trachea - The tube in your throat that carries air to your lungs., Diaphragm - The muscle between your lungs and your stomach that helps you to breathe., Carbon Dioxide - A gas that has no color or smell that people and animals breathe out., Pulse - The beating of your heart that you feel in different parts of your body, especially in your wrist.,

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