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I'm reading this Wikipedia article on blood pressure and its regulation, and it mentions that medulla is involved. however, I vaguely remember reading another article on Wikipedia and it mentioned that hypothalamus or hippocampus could be involved. So my question is - what other parts of the brain or neurotransmitters have significant effect on blood pressure regulation?

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You may want to look at vasopressin – nico Jun 5 '13 at 6:30
Thanks, vasopressin does appear to affect blood pressure a bit in healthy individuals. There is a duplicate mention of blood pressure in the part of the article that deals with nervous system, but I'm not sure if this is the same or different effect – Alex Stone Jun 8 '13 at 1:55

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