Table of contents

1. Introduction to Anatomy & Physiology5h 43m
2. Cell Chemistry & Cell Components12h 36m
3. Energy & Cell Processes10h 6m
4. Tissues & Histology10h 3m
5. Integumentary System2h 20m
6. Bones & Skeletal Tissue2h 16m
7. The Skeletal System2h 35m
8. Joints2h 17m
9. Muscle Tissue2h 33m
10. Muscles1h 11m
11. Nervous Tissue and Nervous System1h 35m
12. The Central Nervous System1h 6m
- Introduction to the Central Nervous System
  18m
- The Cerebrum
  48m
13. The Peripheral Nervous System1h 26m
14. The Autonomic Nervous System1h 38m
15. The Special Senses2h 41m
16. The Endocrine System2h 48m
17. The Blood3h 22m
18. The Heart3h 42m
19. The Blood Vessels3h 35m
20. The Lymphatic System3h 16m
21. The Immune System14h 37m
22. The Respiratory System3h 20m
23. The Digestive System2h 5m
24. Metabolism and Nutrition4h 0m
25. The Urinary System2h 39m
26. Fluid and Electrolyte Balance, Acid Base Balance37m
27. The Reproductive System2h 5m
28. Human Development1h 21m
29. Heredity3h 32m

26. Fluid and Electrolyte Balance, Acid Base Balance

Electrolyte Balance

Anatomy & Physiology

26. Fluid and Electrolyte Balance, Acid Base Balance

Electrolyte Balance

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Problem 17

Textbook Question

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

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.

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.

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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