yeah, that makes sense, i think magnesium limits calcium absorption though, but i never heard this idea that potassium limits/relates to calcium, but it totally makes sense

i always had this impression, sodium and calcium relate to muscle tensing, and magnesium and potassium relate to relaxing, they call it polarising and depolarising, the muscle fibres shorten and lengthen in accordance with ionic/electrostatic effects of current flowing through them, and normally the nerves conduct these opposing voltages with these opposite ions, so it still is consistent with the potassium/magnesium vs calcium/sodium pattern, but it's related to not only the nerves but the muscles as well

muscles function partially by electrostatic effects as well and nerves have this in their function in the dendrites, the "ion channels" that conduct signals, so, yeah, these 4 minerals are definitely all tied together in neuromuscular health