The hypothalamus sends messages through the brainstem and spinal cord to the autonomic nervous system, causing sympathetic effects such as:

Question

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The hypothalamus, when activating the sympathetic nervous system, causes effects such as increased heart rate. This is part of the "fight or flight" response, which prepares the body for action. Decreased blood pressure, decreased temperature, and increased peristalsis are not typical sympathetic responses.

The Hypothalamus Sends Messages Through the Brainstem and Spinal Cord