Skip to main content
Ch. 24 The Urinary System
Amerman- Human Anatomy & Physiology 3e
Amerman3rd EditionHuman Anatomy & PhysiologyISBN: 9780138247201, 9780138247928, 9780138201814Not the one you use?Change textbook
All textbooksAmerman 3rd EditionCh. 24 The Urinary SystemProblem L3.A1a
Chapter 24, Problem L3.A1a

Drugs that treat hypertension, or high blood pressure, have the following actions. Discuss the specific effect that each drug will have on the kidneys.
a. Blocking the action of aldosterone on the kidneys

Verified step by step guidance
1
Understand the role of aldosterone: Aldosterone is a hormone produced by the adrenal glands that acts on the kidneys to increase sodium reabsorption and potassium excretion. This process helps retain water, increasing blood volume and, consequently, blood pressure.
Identify the effect of blocking aldosterone: Blocking aldosterone (e.g., with aldosterone antagonists like spironolactone) prevents sodium reabsorption in the distal tubules of the nephron. This leads to increased sodium and water excretion in the urine, reducing blood volume and lowering blood pressure.
Consider the impact on potassium levels: Since aldosterone promotes potassium excretion, blocking its action reduces potassium excretion. This can lead to higher potassium levels in the blood (hyperkalemia), which is a potential side effect of these drugs.
Relate the effect to hypertension treatment: By reducing blood volume through increased sodium and water excretion, these drugs help lower blood pressure, making them effective in treating hypertension.
Summarize the kidney-specific effects: Blocking aldosterone decreases sodium reabsorption, increases water excretion, reduces blood volume, and lowers blood pressure, while also potentially increasing potassium retention in the blood.

Verified video answer for a similar problem:

This video solution was recommended by our tutors as helpful for the problem above.
Was this helpful?

Key Concepts

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

Aldosterone

Aldosterone is a steroid hormone produced by the adrenal glands that plays a crucial role in regulating blood pressure and fluid balance. It promotes sodium reabsorption in the kidneys, which leads to water retention, increasing blood volume and pressure. Understanding its function is essential for analyzing how drugs that block aldosterone can affect kidney function and overall blood pressure.
Recommended video:
11:30
Renin-Angiotensin-Aldosterone-System

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. Drugs that block aldosterone disrupt this system, leading to decreased sodium reabsorption and lower blood pressure, which is vital for understanding their impact on the kidneys.
Recommended video:
11:30
Renin-Angiotensin-Aldosterone-System

Diuretics

Diuretics are medications that promote the excretion of water and electrolytes through urine, effectively reducing blood volume and pressure. They often work by inhibiting sodium reabsorption in the kidneys, which can counteract the effects of aldosterone. Understanding how diuretics interact with kidney function is important for discussing their role in treating hypertension and their specific effects on renal physiology.
Recommended video:
0:48
Renal Physiology Step 2: Tubular Reabsorption Example 5
Related Practice
Textbook Question

Mr. Gupta has been diagnosed with nephrotic syndrome, which is characterized by the loss of plasma proteins such as albumin into the urine. What impact will this have on his colloid osmotic pressure? How will this affect the net filtration pressure in his capillary beds? What effect will this likely cause?

2
views
Textbook Question

Mr. Yao is a patient with kidney disease who presents to your clinic for monitoring. You notice on his chart that his GFR was estimated through inulin administration to be about 35 ml/min. What does this tell you about the health of his kidneys? Mr. Yao is taking a medication that is normally excreted from the body in the urine. You order blood work and find that the concentration of this medication in his plasma is much higher than normal. How does his decreased GFR explain the elevated level of medication in his plasma?

1
views
Textbook Question

Explain how each of the drugs in question 1 from this section would lower blood pressure.

1
views
Textbook Question

Deana is a 4-year-old girl with a rare genetic defect that causes the Na+/glucose symporters in the proximal tubule to reabsorb fewer glucose and sodium ions than normal. Predict the effects this defect will have on the composition and volume of Deana's urine. Explain why you would expect to see increased activity of the tubuloglomerular feedback and the renin-angiotensin-aldosterone system in Deana's kidneys.

6
views
Textbook Question

What might it mean if you found a high concentration of urobilinogen in your patient's urine? (Hint: Consider the source of urobilinogen.)

5
views
Textbook Question

Drugs that treat hypertension, or high blood pressure, have the following actions. Discuss the specific effect that each drug will have on the kidneys.

c. Blocking the Na+/Cl−/2K+ transport pumps in the thick ascending limb of the nephron loop

2
views