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The brain stem is divided into three section known as: midbrain, pons, and medulla oblongatta. The medulla is referred to as the cardiac and respiratory centers of the body. It is in the medulla oblongatta that the basic control of the external respiration that occurs in the lungs. The medulla sends a signal via the phrenic nerve that control the involuntary portion of breathing. Breathing is a process that is unique in the body in that it is controlled both by voluntary and involuntary mechanisms.

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15y ago

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