Final answer:
The indication of successful teaching about aldosterone's role in water and electrolyte balance is an increased blood volume (option 5). Aldosterone helps to conserve sodium and water, thereby increasing blood volume and maintaining electrolyte balance.
Step-by-step explanation:
The correct information indicating that teaching by the nurse was successful regarding the actions of aldosterone in regulating water and electrolyte balance is option 5) Increased blood volume.
Aldosterone is a hormone that manages water and electrolyte balance within the body. It primarily drives the reabsorption of sodium and water, and the excretion of potassium in the kidneys. This process helps to increase blood volume and blood pressure when they are low. When aldosterone is released due to decreased blood volume or blood sodium levels, or increased potassium levels, it acts on the kidneys to retain sodium and water, leading to an increase in blood volume. Conversely, it also leads to the excretion of potassium, thus maintaining the balance of electrolytes.
Options 1) Increased urine output and 2) Decreased blood pressure would not suggest successful teaching as they typically occur when aldosterone levels are low. Option 3) Decreased sodium levels and 4) Increased potassium levels would suggest a problem with aldosterone function or an unrelated issue since aldosterone normally works to decrease potassium and increase sodium in the blood. Therefore, the direct answer to the student's question is that an increase in blood volume signifies successful teaching on the role of aldosterone in water and electrolyte balance.
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