Which functions are regulated by the medulla's nuclei?

• A. Breathing and heart rate
• B. Vision
• C. Hearing
• D. Taste

Answer: (A)

The medulla contains autonomic centers that regulate our most basic life-sustaining functions, especially breathing and heart rate. In the medulla, the dorsal respiratory group sets the basic rhythm of inhalation, and the ventral respiratory group helps with expiration and breathing adjustments during greater demand. The cardioinhibitory and related medullary nuclei coordinate heart rate and vascular tone, sending parasympathetic signals via the vagus and interacting with sympathetic pathways to speed or slow the heart as needed. This combination explains why breathing and heart rate are the functions governed by the medulla’s nuclei.

Visual processing relies on the occipital cortex and visual pathways; hearing involves brainstem and cortical auditory pathways that are not governed by a single medullary control center; taste is carried through gustatory pathways to the nucleus of the solitary tract but is more about sensory relay than the primary regulation of autonomic function.