^I would learn it this way instead. Remember that K+ is a vasodilator.
To answer your question, acidosis is caused by the hyperkalemia. Hyperkalemia causes partial depolarization of the cell membrane which decreases the amount of Ca2+ available for cardiac contractility. If you lower the calcium, you decrease the strength of contractility.
Basic question, but why would it be hyperkalemia instead of hypokalemia?
I thought it would be hypokalemia: increased acidosis would "kick out" potassium -> causing hypokalemia -> potassium efflux causing weakness/flaccidity
In addition to decreased contractility, acidosis causes:
hyperkalemia (which was correct by the other poster, still not sure why, maybe because the H/K exchange pump stops, and potassium gets trapped?)
GABA
kussmaul breathing
Hyperkalemia due to H/K pump and the intrinsic nature of acids being proton donors. Sustained acidosis drives the H/K pump in a manner that favors H in, K out.
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