The rate and depth of breathing is primarily controlled by the medulla by_____.

Which of the following statements are correct?

1. The esophagus and the trachea open into the pharynx.
2. The epiglottis prevents the entry of food into the glottis during swallowing.
3. Mucus in saliva helps in lubricating and adhere the masticated food particles into a bolus.

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Which of the following terms is/are correct?

1. Tidal air: volume of air which remains in the lungs.
2. Residual air: volume of air entering and leaving the lungs during normal breathing.

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