The phase of pulmonary ventilation in which air is expelled from the alveoli is:

A. Pain over the eyes is associated with sinusitis in the frontal sinuses (located above the eyes), not the maxillary sinuses.
B. The maxillary sinuses are located in the cheeks, so pain related to maxillary sinusitis is typically felt in this area.
C. Pain over the ears is not typically associated with sinusitis; it is more common with ear infections or other middle ear conditions.
D. Pain above the eyebrows is typically related to frontal sinusitis, not maxillary sinusitis.

A. The cerebellum is involved in coordinating movement and balance but is not primarily responsible for regulating respiration.
B. The diencephalon is involved in sensory processing and regulation of autonomic functions but does not directly control respiration.
C. The cerebral cortex is involved in voluntary control over breathing (such as when you hold your breath), but the central regulation of breathing is managed by the brainstem.
D. The brainstem (specifically the medulla oblongata and pons) is the primary control center for respiration. It regulates the rate and depth of breathing by responding to levels of oxygen and carbon dioxide in the blood.