PhysiologyLesson 1 of 1 in the course The Urinary System

Hormonal Regulation of Renal Fluid, Vascular, and Mineral Balance

5 flashcards · 5 quiz questions · 5 match pairs · 5 fill-in sentences · English

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Summary

Kidney function is adjusted by hormones and locally acting signals that respond to changes in blood volume, pressure, and plasma composition. This lesson follows the renin–angiotensin–aldosterone system (RAAS), antidiuretic hormone (ADH), and endothelin, focusing on how they affect blood vessels and the recovery of water and electrolytes.

The renin–angiotensin–aldosterone system (RAAS) responds to conditions such as reduced extracellular fluid volume and falling blood pressure. Its effects include a rapid change in vascular tone and a more sustained change in sodium and water recovery.

All flashcards

How does aldosterone affect sodium, potassium, and water balance?
It increases renal sodium reabsorption and potassium excretion; water follows the retained sodium, supporting blood volume.
How does ADH promote water recovery in the collecting ducts?
ADH promotes aquaporin insertion into the apical membranes of principal cells, allowing water to move toward the hyperosmotic medulla.
What renal changes does atrial natriuretic hormone promote?
ANH increases GFR by dilating the afferent and constricting the efferent arteriole, and decreases sodium reabsorption in the distal convoluted tubule.
How do natriuretic hormones affect sodium and water excretion?
They inhibit aldosterone and ADH, reducing sodium and water recovery and increasing their urinary excretion.
How does PTH affect phosphate handling and vitamin D activation in the kidney?
PTH promotes calcitriol formation in the proximal convoluted tubule and reduces phosphate reabsorption, increasing phosphate excretion.

Quiz questions

  1. Which cells release renin at the juxtaglomerular apparatus?Answer: Juxtaglomerular cells in the afferent arteriole
  2. What reaction does angiotensin-converting enzyme catalyze?Answer: Conversion of angiotensin I into angiotensin II
  3. How does atrial natriuretic hormone increase glomerular filtration pressure?Answer: It dilates the afferent arteriole and constricts the efferent arteriole
  4. What property helps make B-type natriuretic peptide useful as a heart-failure marker?Answer: Its relatively long biological half-life
  5. Which kidney cells are among the sources of endothelin?Answer: Endothelial cells of renal blood vessels

Based on Anatomy and Physiology 2e by J. Gordon Betts, Kelly A. Young, James A. Wise, Eddie Johnson, Brandon Poe, Dean H. Kruse, Oksana Korol, Jody E. Johnson, Mark Womble, Peter DeSaix (OpenStax), licensed CC BY 4.0. Adapted into a summary, flashcards and quizzes.

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