Final answer:
Both a decrease in potassium ions and a decrease in blood pressure stimulate the release of aldosterone, which acts to increase blood sodium levels and, consequently, blood volume and pressure.
Step-by-step explanation:
True, both a decrease in potassium ions and a decrease in blood pressure will stimulate the release of aldosterone.
This hormone, which is crucial in regulating electrolyte balance, is released when there is an elevated blood level of potassium or a severe decrease in blood levels of sodium.
Additionally, a drop in blood pressure can trigger the renin-angiotensin-aldosterone system (RAAS), leading to aldosterone release.
Aldosterone's main functions include stimulating the kidneys to reabsorb sodium and excrete potassium.
This action helps to increase blood volume and blood pressure, as water tends to follow sodium due to osmosis.
Consequently, this hormone plays a significant role in maintaining blood pressure and electrolyte balance.