Which part of the brainstem regulates autonomic functions such as respiration and heart rate?

• A. Pons
• B. Cerebellum
• C. Brainstem
• D. Medulla oblongata

Answer: (D)

Autonomic control of essential life-sustaining functions is centralized in the medulla oblongata. This part of the brainstem contains the centers that regulate heart rate and the rhythm of breathing, including the neural groups that set breathing patterns and the cardiac centers that speed up or slow down the heart. It also processes sensory input from sensors like baroreceptors and chemoreceptors to continuously adjust respiration and heart activity. The pons helps modulate breathing but isn’t the primary regulator of heart rate, and the cerebellum handles coordination rather than autonomic control. So, the medulla oblongata is the region most responsible for regulating respiration and heart rate.