Renal Physiology and Function Quiz
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Questions and Answers

What percentage of the body's weight do the kidneys represent?

  • 0.25%
  • 0.5% (correct)
  • 1%
  • 2%
  • How much of the cardiac output do the kidneys receive in terms of renal blood flow?

  • 20-25% (correct)
  • 15-20%
  • 5-10%
  • 10-15%
  • What proportion of the oxygen extracted by the kidneys is utilized for renal function?

  • 80% (correct)
  • 60%
  • 20%
  • 40%
  • What is the daily amount of renal blood flow received by the kidneys?

    <p>180 liters</p> Signup and view all the answers

    For what purpose is approximately 20% of the oxygen consumed by the kidneys used?

    <p>Nutritional needs</p> Signup and view all the answers

    What occurs during vasoconstriction?

    <p>Decrease in pressure downstream</p> Signup and view all the answers

    Which statement is true regarding vasodilation?

    <p>It results in increased flow downstream.</p> Signup and view all the answers

    How does vasoconstriction affect blood pressure upstream?

    <p>It increases pressure upstream.</p> Signup and view all the answers

    Which of the following occurs with vasodilation?

    <p>Increase in vessel diameter.</p> Signup and view all the answers

    Which result is associated with decreased diameter in blood vessels?

    <p>Decreased blood flow downstream</p> Signup and view all the answers

    What happens to urine as it passes through the first part of the distal convoluted tubule?

    <p>It becomes more diluted.</p> Signup and view all the answers

    What is the primary role of the vasa recta in relation to juxtamedullary nephrons?

    <p>To establish the cortico-medullary osmotic gradient.</p> Signup and view all the answers

    Which ions are primarily eliminated through secretion in the distal convoluted tubule and collecting duct?

    <p>H+ and K+ ions</p> Signup and view all the answers

    In which segment of the Henle's loop does water primarily leave the filtrate?

    <p>Descending thin segment</p> Signup and view all the answers

    What regulates the reabsorption process in the distal convoluted tubule and collecting duct?

    <p>Hormonal control</p> Signup and view all the answers

    What percentage of urea is reabsorbed in the proximal convoluted tubule?

    <p>50%</p> Signup and view all the answers

    What percentage of water is reabsorbed in the descending thin segment of the Henle's loop?

    <p>15%</p> Signup and view all the answers

    In the last part of the distal convoluted tubule and the collecting duct, what is adjusted to produce final urine?

    <p>Osmolarity and volume of body fluids</p> Signup and view all the answers

    Which statement accurately describes the reabsorption process in the ascending thin segment of the Henle's loop?

    <p>Sodium, chloride, and potassium are reabsorbed with no water loss.</p> Signup and view all the answers

    Which part of the nephron is impermeable to urea?

    <p>Distal convoluted tubule</p> Signup and view all the answers

    What is the function of reabsorption occurring in the distal convoluted tubule?

    <p>To adjust osmolarity and volume of body fluids</p> Signup and view all the answers

    How does urea reabsorption affect the cortico-medullary osmotic gradient?

    <p>It contributes to strengthening the cortico-medullary osmotic gradient.</p> Signup and view all the answers

    How does asymmetric NaCl and water reabsorption affect the renal medulla?

    <p>It contributes to an osmotic gradient in the renal medulla.</p> Signup and view all the answers

    What is the primary role of urea in urine?

    <p>To serve as the most abundant component of urine.</p> Signup and view all the answers

    Where is urea primarily filtered in the nephron?

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

    What is primarily eliminated by the secretion processes in the Proximal Convulsed Tubule?

    <p>Xenobiotics like antibiotics, medication, and dyes</p> Signup and view all the answers

    Which ion is secreted in conjunction with bicarbonate absorption in the Proximal Convulsed Tubule?

    <p>H+ ions</p> Signup and view all the answers

    What process leads to the secretion of ammonia (NH3) in the Proximal Convulsed Tubule?

    <p>Deamination of glutamate and glutamic acid</p> Signup and view all the answers

    What role do the protons released from the deamination of ammonia play in the body?

    <p>They are important for acid-base homeostasis</p> Signup and view all the answers

    Which substance is NOT primarily associated with the secretion process in the Proximal Convulsed Tubule?

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

    What role does ATP play in the process depicted in the diagram?

    <p>It transports sodium ions from the interstitial fluid into the cell.</p> Signup and view all the answers

    Which enzyme is responsible for generating carbonic acid from water and carbon dioxide?

    <p>Carbonic anhydrase (AC)</p> Signup and view all the answers

    During the process, what occurs when sodium ions cotransport with protons through the transporter?

    <p>Carbonic acid is formed and later dissociates.</p> Signup and view all the answers

    What is produced as a result of the breakdown of carbonic acid in the process?

    <p>Water and carbon dioxide</p> Signup and view all the answers

    Which component is directly involved in the exchange process alongside sodium ions?

    <p>Bicarbonate ions</p> Signup and view all the answers

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