Crucigrama Parts of the respiratory system.Versión en línea Parts of the respiratory system. por Laura Riesco 1 The two entry points to the respiratory system, they are on the inside of the nose. 2 A solid tube that carries air to the lungs. 3 Two tubes that divide the trachea. 4 Two spongy organs for the air to gets in the body. 5 A muscle that contracts and relaxes to let us breathe in and out. 6 Small organs at the end of the bronchioles, where gas exchange occurs. 5 4 2 3 6
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