1) Explain the significance of bronchi in the process of respiration. a) They conduct air from trachea to lung, enables airflow b) They filter and humidify the air before it reaches lung  2) What substance is found in the pleural cavity that aids in reducing friction during breathing? a) Synovial fluid b) Pleural fluid 3) What is the primary function of the vocal folds in the respiratory system? a) To produce sound b) To facilitate gas exchange

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