Physiology PHA2113081 - Renal System - Part 2: Functional Anatomy of the Kidneys
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Questions and Answers

Where does the reabsorption process start in the nephron?

  • Proximal Convoluted Tubule (PCT) (correct)
  • Descending Limb
  • Distal Collecting Tubule (DCT)
  • Loop of Henle
  • What percentage of water and Na+ ions are reabsorbed in the Proximal Convoluted Tubule (PCT)?

  • 80%
  • 10%
  • 35%
  • 65% (correct)
  • Where does around 25% of the total water and Na+ get reabsorbed in the nephron?

  • Loop of Henle (correct)
  • Afferent arteriole
  • Glomerulus
  • Efferent arteriole
  • Which structure in the nephron is responsible for the remaining absorption of water and salt (Na+)?

    <p>Distal Collecting Tubule (DCT)</p> Signup and view all the answers

    What is the main functional unit of the kidney that produces urine?

    <p>Nephron</p> Signup and view all the answers

    How much fluid is filtrated throughout the day in the nephron?

    <p>$180L$</p> Signup and view all the answers

    What is the first step in the absorption process of glucose molecules into the epithelial cell?

    <p>Creation of a Na gradient by the Na/K pump</p> Signup and view all the answers

    What mechanism creates an osmotic gradient to facilitate the reabsorption of water in the loop of Henle?

    <p>Countercurrent system</p> Signup and view all the answers

    Which part of the loop of Henle is responsible for the reabsorption of water?

    <p>Descending limb</p> Signup and view all the answers

    What regulates the reabsorption of water and Na+ in the distal convoluted tubule and collecting duct?

    <p>ADH (Vasopressin)</p> Signup and view all the answers

    What defines the reabsorption rate for a specific substance during the transportation of molecules across tubular epithelial cells?

    <p>Number of carrier proteins</p> Signup and view all the answers

    Which system creates and maintains the osmotic gradient in the loop of Henle?

    <p>Countercurrent system</p> Signup and view all the answers

    What is the main mechanism for controlling Na+ reabsorption in the distal convoluted tubule and collecting duct?

    <p>Renin-Angiotensin-Aldosterone System</p> Signup and view all the answers

    What is the primary function of the kidneys within the urinary system?

    <p>Regulation of blood pressure</p> Signup and view all the answers

    Where does the majority of urine production take place within the kidney?

    <p>Renal Cortex</p> Signup and view all the answers

    What is the main functional unit of the kidneys involved in urine production?

    <p>Nephron</p> Signup and view all the answers

    Which part of the urinary system receives urine from the kidneys for storage?

    <p>Ureters</p> Signup and view all the answers

    What is the approximate percentage of cardiac output received by the kidneys?

    <p>~20%</p> Signup and view all the answers

    Which organ in the urinary system plays a significant role in the activation of Vitamin D?

    <p>Kidneys</p> Signup and view all the answers

    What is the main driving force behind glomerular filtration?

    <p>Hydrostatic pressure in the glomerular capillary</p> Signup and view all the answers

    Which of the following is NOT a component of the filtration barrier in the glomerulus?

    <p>Permeability of the glomerular membrane</p> Signup and view all the answers

    What regulates the glomerular filtration rate (GFR) apart from the pressures at the glomerular membrane?

    <p>Permeability of the glomerular membrane</p> Signup and view all the answers

    What is the function of the juxtaglomerular apparatus in the nephron?

    <p>Regulates glomerular filtration rate</p> Signup and view all the answers

    Which structure comes into contact with the afferent arteriole in the juxtaglomerular apparatus?

    <p>Thick ascending limb</p> Signup and view all the answers

    What term is used to describe the volume of fluid filtered from the glomeruli into Bowman’s space per unit time?

    <p>Glomerular filtration rate (GFR)</p> Signup and view all the answers

    Which pressure is responsible for moving fluid into Bowman’s capsule during glomerular filtration?

    <p>+60 mmHg glomerular capillary blood pressure</p> Signup and view all the answers

    'Valuable substances selectively returned to the blood from the nephron' refers to which process?

    <p>Tubular reabsorption</p> Signup and view all the answers

    'Unneeded substances selectively removed from the blood and added to the nephron' describes which process?

    <p>Tubular secretion</p> Signup and view all the answers

    What is filtrated into Bowman’s capsule during glomerular filtration?

    <p>Water, ions, nutrients, and other small molecules</p> Signup and view all the answers

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