How come sodium increases blood pressure, but potassium, which has to some extent similar properties helps lower it?


potassium is really the main guy in charge of everything that happens involving action potentials which in turn govern homeostasis such as blood pressure.

k+ lowers blood pressure due to making it harder to get an action potential going, which in the macro scale causes the heart to pump less.

too much k+ kills the person as it stops the pumping of blood (lethal injections are just lots and lots of k+ along with some pain killing drugs)

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    $\begingroup$ This provides some information but does not fully answer the question. Why is $K^+$ the main "guy" rather than $Na^+$. The question assumes that they have similar properties. In what ways relevant to the question are these two ions different? $\endgroup$ – vkehayas Oct 27 '17 at 19:12
  • $\begingroup$ I agree with @vkehayas but I'd go a step further to say that this answer is completely wrong as far as the mechanisms for what the OP is asking about. We aren't talking about lethal injection levels of K+ or anything about K+ concentration effects on action potentials when talking about K+ effects on blood pressure. $\endgroup$ – Bryan Krause Oct 27 '17 at 22:17

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