The base of the brainstem that controls heartbeat and breathing is the?

• A. Pons
• B. Medulla
• C. Thalamus
• D. Hypothalamus

Answer: (B)

The medulla oblongata sits at the base of the brainstem and contains the body's vital autonomic centers. It directly regulates heartbeat through the cardiac center and controls breathing via the respiratory rhythm centers, making it the part responsible for these life-sustaining functions. The pons sits above it and helps modulate breathing, but it isn’t the primary controller of heart rate. The thalamus acts as a sensory relay and isn’t involved in autonomic heart or respiratory control. The hypothalamus influences many autonomic and endocrine processes, but the immediate regulation of heartbeat and breathing comes from the medulla.