What does a significant increase in blood pressure trigger in the kidneys?

A significant increase in blood pressure leads to increased sodium excretion and diuresis in the kidneys, a response primarily mediated by the pressure natriuresis mechanism. When blood pressure rises, it causes an increase in renal perfusion pressure, which promotes the filtration of blood through the kidneys. In this context, the kidneys aim to maintain homeostasis by excreting excess sodium (natriuresis) and water (diuresis) to help lower blood pressure back to normal levels. This process helps to regulate fluid balance and blood volume, ultimately contributing to the control of blood pressure.

The other options do not align with the physiological response to a significant increase in blood pressure. Instead, the increase in filtration and sodium excretion is a critical compensatory mechanism that kidneys utilize to mitigate excessive blood pressure elevations.