Which structure in the brainstem regulates vital functions such as heart rate and respiration?

• A. Brainstem
• B. Medulla Oblongata
• C. Cerebellum
• D. Cerebrum

Answer: (B)

The medulla oblongata handles autonomic control of life-sustaining functions, including heart rate and respiration. It houses the cardiac center that modulates heart rate and the respiratory centers—the dorsal and ventral respiratory groups—that generate and coordinate breathing rhythm. It also integrates input from sensors like chemoreceptors and baroreceptors and sends command signals to the heart and respiratory muscles via autonomic pathways. While the brainstem overall supports many reflexes, this specific structure is where the key autonomic centers for heart rate and breathing reside. The cerebellum is involved in movement coordination, and the cerebrum governs higher cognitive functions, not basic autonomic regulation.