Biological Bases Of Behavior Practice Test

The base of the brainstem controls heartbeat and breathing. Which structure is this?

Pons Cerebellum Thalamus Medulla

Correct Answer:

Medulla

Explanation:

The basic autonomic control of life-sustaining functions comes from the brainstem, with the medulla oblongata serving as the primary command center. It houses the cardioacceleratory and cardioinhibitory centers that regulate heart rate and the dorsal and ventral respiratory groups that generate and adjust breathing rhythm. It also receives input from chemical sensors and sends output to the heart and lungs, primarily through the vagus nerve and other pathways. While other brain regions contribute to related functions—such as the pons modulating breathing patterns, the cerebellum coordinating movement, and the thalamus relaying sensory information—the medulla is the key structure at the base of the brainstem responsible for heartbeat and breathing.

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