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The sympathetic nervous system prepares the body for the "fight-or-flight" response by increasing heart rate and other physiological changes.
Ref: NCERT Class 11 Biology Chapter 18: Neural Control and Coordination Peripheral and Autonomic Nervous System - Cranial and Spinal Nerves
The medulla oblongata regulates heart rate by controlling autonomic nervous system signals.
Ref: NCERT Class 11 Biology Chapter 15: Body Fluids and Circulation Circulatory System - Comparative and Evolutionary Aspects
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