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Ch. 25 Fluid, Electrolyte, and Acid-Base Homeostasis
Amerman - Human Anatomy & Physiology 2nd Edition
Amerman2nd EditionHuman Anatomy & PhysiologyISBN: 9780136873822Not the one you use?Change textbook
All textbooksAmerman 2nd EditionCh. 25 Fluid, Electrolyte, and Acid-Base HomeostasisProblem 17
Chapter 25, Problem 17

Which of the following statements correctly describe(s) the role of aldosterone?
a. Aldosterone triggers sodium ion and so water reabsorption.
b. Aldosterone triggers potassium ion secretion.
c. Aldosterone triggers hydrogen ion secretion.
d. Both a and b are correct.
e. All of the above are correct.

Verified step by step guidance
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Step 1: Understand the role of aldosterone. Aldosterone is a hormone secreted by the adrenal cortex that plays a key role in regulating electrolyte balance and blood pressure. It primarily acts on the distal tubules and collecting ducts of the nephron in the kidneys.
Step 2: Analyze statement (a). Aldosterone promotes the reabsorption of sodium ions (Na⁺) from the filtrate back into the bloodstream. Since water follows sodium due to osmosis, this also leads to water reabsorption, which helps maintain blood volume and pressure.
Step 3: Analyze statement (b). Aldosterone also triggers the secretion of potassium ions (K⁺) into the filtrate. This is important for maintaining proper potassium levels in the blood and overall electrolyte balance.
Step 4: Analyze statement (c). Aldosterone can also promote the secretion of hydrogen ions (H⁺) into the filtrate, which helps regulate acid-base balance in the body by reducing acidity in the blood.
Step 5: Evaluate the options. Based on the analysis of statements (a), (b), and (c), determine whether each statement is correct and identify the option that includes all correct statements.

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Aldosterone Function

Aldosterone is a steroid hormone produced by the adrenal glands that plays a crucial role in regulating sodium and potassium levels in the body. It promotes sodium reabsorption in the kidneys, which leads to water retention, thereby increasing blood volume and blood pressure. Additionally, aldosterone facilitates the secretion of potassium ions, helping to maintain electrolyte balance.
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Electrolyte Balance

Electrolyte balance refers to the proper concentration of ions in the body fluids, which is essential for various physiological functions, including nerve conduction, muscle contraction, and hydration. Aldosterone's role in regulating sodium and potassium levels is vital for maintaining this balance, as an imbalance can lead to serious health issues such as hypertension or cardiac problems.
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Renin-Angiotensin-Aldosterone System (RAAS)

The Renin-Angiotensin-Aldosterone System (RAAS) is a hormone system that regulates blood pressure and fluid balance. When blood pressure drops, renin is released, leading to the production of angiotensin II, which stimulates aldosterone secretion. This system is critical for understanding how aldosterone functions in response to changes in blood pressure and volume.
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Related Practice
Textbook Question

Mark the following statements as true or false. If a statement is false, correct it to make a true statement.

c. Respiratory compensation for metabolic acidosis consists of hypoventilation.

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Textbook Question

Mark the following statements as true or false. If a statement is false, correct it to make a true statement.

d. Renal compensation for metabolic alkalosis consists of reabsorption of hydrogen ions and secretion of bicarbonate ions.

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Textbook Question

Mark the following statements as true or false. If a statement is false, correct it to make a true statement.

e. You would expect to find an elevated Pco₂ in arterial blood gas analysis of a patient with respiratory acidosis.

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Textbook Question

How does angiotensin-II help to restore fluid balance when a person is dehydrated?

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