Effects Of Low Blood Pressure

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Mary is suffering from compensated metabolic acidosis. Her blood pressure was quite low and even lower when upright, as venous blood pooled in lower extremities decreasing venous return and hence cardiac output and arterial pressure. Over a couple of days, what effect would you expect low blood pressure to have had on the

i) renin-angiotensin II-aldosterone system and

ii) subsequently K+ concentration?