Forgive, but I must don my Duns Scotus costume and pray for enlightenment. 
What is the relationship between salt excretion, blood and tissue salt levels, and systolic blood pressure? It's not clear where the arrows go. Naively, not understanding the relationship between intake of salt (and fluids), metabolism, and excretion of salt (and fluids), it would seem that if metabolism is constant, and excretion increases, blood and tissue levels should drop. But that doesn't appear to be what they're saying. So what are the relationships (especially that of how systolic bp correlates to things, as it's not clear that they have any indice of salt saturation in the blood and tissues)?
What is the relationship between salt excretion, blood and tissue salt levels, and systolic blood pressure? It's not clear where the arrows go. Naively, not understanding the relationship between intake of salt (and fluids), metabolism, and excretion of salt (and fluids), it would seem that if metabolism is constant, and excretion increases, blood and tissue levels should drop. But that doesn't appear to be what they're saying. So what are the relationships (especially that of how systolic bp correlates to things, as it's not clear that they have any indice of salt saturation in the blood and tissues)?
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