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Please enter search text of at least 2 characters. Evolution of Life How Ventilation is Regulated Did you know that our nervous system controls our breathing? There are three levels of bronchi which are best shown in another diagram that displays just the airways with the lungs removed. Then we had the cribriform plate which is located at the roof of the nasal cavity followed by the Eustachian tubes which are represented by this tiny hole here. In periods of increased metabolic demand, in other words, when more oxygen or waste removal is required, accessory muscles are activated to increase the depth and rate of breathing. There are two pipes leaving the pharynx — the trachea and the esophagus.
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