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There are two pathways.
1) Sympathetic Pathway where the hypothalamus sends information to the brain stem and it travels down the spine to the adrenal medullar. Then, adrenaline and noradrenaline are released which effectively causes the heart rate and blood pressure to rise as oxygen is being released to the muscles
2) Parasympathetic Pathway: reverses the effects of the Sympathetic pathway. So the heart rate and blood pressure returns to normal.
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