Renal Physiology: Parts of Nephrons

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Questions and Answers

What is the main function of the juxtamedullary nephrons?

  • Reabsorption of nutrients
  • Filtration of blood
  • Concentration of urine (correct)
  • Removal of waste products

Which part of the nephron is responsible for the reabsorption of water and essential substances?

  • Collecting duct
  • Distal convoluted tubule
  • Bowman's capsule
  • Proximal convoluted tubule (correct)

Which of the following is NOT a part of the nephron?

  • Renal artery (correct)
  • Distal convoluted tubule
  • Glomerulus
  • Loop of Henle

What is the primary function of the renal blood flow?

<p>Filtration (B)</p> Signup and view all the answers

Which type of nephrons are responsible for the removal of waste products and the reabsorption of nutrients?

<p>Cortical nephrons (C)</p> Signup and view all the answers

What is the primary function of the ascending limb of the Loop of Henle?

<p>Reabsorption of solutes (D)</p> Signup and view all the answers

What percentage of the blood pumped through the heart is filtered by the kidneys at all times?

<p>25% (D)</p> Signup and view all the answers

What is the purpose of the Renin-Angiotensin-Aldosterone System in the kidney?

<p>To regulate blood flow to the kidney (D)</p> Signup and view all the answers

What is the function of the podocytes in the visceral epithelium of Bowman's capsule?

<p>To intertwine their foot processes and create a filtration barrier (C)</p> Signup and view all the answers

What is the primary function of the basement membrane/basal lamina in the glomerular filtration process?

<p>To restrict the passage of large molecules and blood cells (B)</p> Signup and view all the answers

How does low blood pressure affect the glomerular filtration process?

<p>It causes dilation of the afferent arterioles and constriction of the efferent arterioles to prevent a marked decrease in blood flow to the kidney (B)</p> Signup and view all the answers

What is the primary function of the capillary wall membrane in the glomerular filtration process?

<p>To allow the passage of plasma substances through its fenestrated endothelial cells (B)</p> Signup and view all the answers

What is the normal range for serum osmolarity?

<p>275 - 300 mOsm (B)</p> Signup and view all the answers

What is the normal range for urine osmolarity?

<p>50 - 1,400 mOsm (A)</p> Signup and view all the answers

What is the ideal U:S Osmolarity Ratio under normal random conditions?

<p>1:1 (C)</p> Signup and view all the answers

What does a positive free water clearance (CH2O) value indicate?

<p>Excess water is being excreted (A)</p> Signup and view all the answers

Which test is used to measure effective renal plasma flow?

<p>Para-aminohippuric Acid Test (PAH) (B)</p> Signup and view all the answers

What is the purpose of the Titratable Acidity and Urinary Ammonia test?

<p>To determine the ability of the kidneys to produce an acid urine (A)</p> Signup and view all the answers

What is the molecular weight of cystatin C?

<p>13,359 (C)</p> Signup and view all the answers

Which clearance test is recommended as the reference method?

<p>Inulin clearance (A)</p> Signup and view all the answers

In the creatinine clearance calculation formula, what does 'V' represent?

<p>Urine volume in mL/min (D)</p> Signup and view all the answers

Which test involves depriving patients of fluids for 24 hours?

<p>Fishberg Test (B)</p> Signup and view all the answers

What is the normal range for creatinine clearance in males?

<p>85 - 125 mL/min (C)</p> Signup and view all the answers

Which test compares the volume and specific gravity of day and night urine samples?

<p>Mosenthal Test (D)</p> Signup and view all the answers

What does the Renin-Angiotensin-Aldosterone System respond to?

<p>Changes in blood pressure and plasma sodium content (C)</p> Signup and view all the answers

Which part of the nephron does not engage in passive transport?

<p>Ascending loop of Henle (D)</p> Signup and view all the answers

What hormone triggers water reabsorption in the collecting duct?

<p>Antidiuretic hormone (D)</p> Signup and view all the answers

Where does tubular concentration primarily occur?

<p>Descending loop of Henle (C)</p> Signup and view all the answers

What is the role of the Renal Threshold in tubular reabsorption?

<p>It sets the maximum level for glucose reabsorption (A)</p> Signup and view all the answers

Which part of the nephron is responsible for removing water through osmosis?

<p>Descending loop of Henle (C)</p> Signup and view all the answers

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