What is the main organ of the respiratory system?, heart, lungs, When we breathe in, we take in a gas called ____, which our body needs to work., oxygen, carbon dioxide, What is the name of the strong muscle below your lungs that helps you breathe? a) Bicep b) Diaphragm c) Trachea, biceps, diaphragm, When we breathe out, what gas do we release from our body?, carbon dioxide, oxygen, Your lungs get bigger when you breathe in and smaller when you breathe out., True, False

Respiratory system

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