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When Tim fainted, the sympathetic division of the ANS failed him, while the parasympathetic division went into overdrive. Parasympathetic stimulation of the vagus nerve caused Tim's heart rate to slow, the force of contractions to decrease, and his blood pressure to drop. As a result, blood flow to the brain decreased, causing the fainting episode. Which part of the brain is critical for maintaining consciousness through its interactions with the cortex?
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