Secondary Active Transport in Kidney Tubules Quiz
30 Questions
1 Views

Choose a study mode

Play Quiz
Study Flashcards
Spaced Repetition
Chat to lesson

Podcast

Play an AI-generated podcast conversation about this lesson

Questions and Answers

What physical forces affect the Glomerular Filtration Rate (GFR)?

  • Plasma-colloid osmotic pressure, Bowman’s capsule hydrostatic pressure, Glomerular filtration pressure
  • Plasma-colloid osmotic pressure, Bowman’s capsule hydrostatic pressure, Net filtration pressure
  • Glomerular capillary plasma pressure, Plasma-colloid osmotic pressure, Glomerular filtration pressure
  • Plasma-colloid osmotic pressure, Bowman’s capsule hydrostatic pressure, Glomerular capillary plasma pressure (correct)

    • Why does the tendency for H2O to move by osmosis oppose glomerular filtration?

  • Due to equal H2O concentration in Bowman's capsule and glomerular capillaries
  • Due to higher H2O concentration in Bowman's capsule compared to glomerular capillaries (correct)
  • Due to lower H2O concentration in Bowman's capsule compared to glomerular capillaries
  • Due to absence of H2O in Bowman's capsule

    • What is the net filtration pressure in the glomerulus?

  • 10 mm Hg (correct)
  • 5 mm Hg
  • 15 mm Hg
  • 20 mm Hg

    • Which pressure forces large volumes of fluid from the blood through the glomerular membrane?

    <p>Net filtration pressure</p> Signup and view all the answers

    What is the average Glomerular Filtration Rate (GFR) in females per day?

    <p>160 liters</p> Signup and view all the answers

    Which physical forces affecting GFR are not subject to regulation under normal conditions?

    <p>Bowman’s capsule hydrostatic pressure and Plasma-colloid osmotic pressure</p> Signup and view all the answers

    What is the primary function of the Na+-K+ pump in the secondary active transport process?

    <p>To set up a Na+ gradient</p> Signup and view all the answers

    Which segment of the nephron reabsorbs the highest percentage of Na+ ions?

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

    What role does Na+ reabsorption play in the ascending limb of the loop of Henle?

    <p>Critical in producing urine of varying concentrations</p> Signup and view all the answers

    Which substance is directly reabsorbed in conjunction with Na+ in the proximal tubule?

    <p>Amino acids</p> Signup and view all the answers

    What is the effect of aldosterone on the distal convoluted tubule and collecting duct?

    <p>Increases Na+ reabsorption</p> Signup and view all the answers

    Why is the active Na+-K+ ATPase pump considered essential for Na+ reabsorption?

    <p>It is responsible for establishing the Na+ gradient</p> Signup and view all the answers

    What is the main mechanism by which kidneys maintain a constant GFR as MAP changes?

    <p>Vasoconstriction of afferent arteriole when GFR is high</p> Signup and view all the answers

    Which structure is responsible for sensing high salt and fluid flow in the tubuloglomerular feedback mechanism?

    <p>Macula densa</p> Signup and view all the answers

    What is the role of ATP in the process of active reabsorption in the kidneys?

    <p>To facilitate transporting substances from tubular lumen to blood</p> Signup and view all the answers

    How much of the glomerular filtrate is typically returned to the blood at a normal GFR of 125 ml/min?

    <p>124 ml/min</p> Signup and view all the answers

    What happens to excess ions, urea, and toxins in the filtrate during tubular reabsorption?

    <p>They become concentrated in the filtrate</p> Signup and view all the answers

    What initiates vasoconstriction of the afferent arteriole in autoregulation when MAP is high?

    <p>Myogenic mechanism</p> Signup and view all the answers

    What is the effect on H+ secretion in response to low H+ concentration in the body fluids?

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

    How does aldosterone impact K+ secretion in the nephron?

    <p>Stimulates K+ secretion</p> Signup and view all the answers

    What is the relationship between plasma K+ concentration and aldosterone secretion?

    <p>High plasma K+ concentration increases aldosterone secretion</p> Signup and view all the answers

    What happens to aldosterone-stimulated renal K+ secretion when plasma K+ concentration declines?

    <p>It decreases</p> Signup and view all the answers

    How does increased aldosterone secretion affect Na reabsorption and K+ secretion?

    <p>Promotes Na reabsorption and stimulates K+ secretion</p> Signup and view all the answers

    What determines the rate of any given substance in urine excretion according to the text?

    <p>GFR, Reabsorption rate, and Secretion rate</p> Signup and view all the answers

    What triggers the granular cells to secrete more renin in response to a fall in NaCl?

    <p>Increased sympathetic activity</p> Signup and view all the answers

    Which hormone increases Na+ reabsorption by the principal cells of the distal and collecting tubules?

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

    What is the function of Angiotensin II in the context of the Renin-Angiotensin-Aldosterone System?

    <p>Stimulates thirst</p> Signup and view all the answers

    What is the main function of ANP and BNP when released due to mechanical stretching of heart muscle cells?

    <p>Regulate ECF volume</p> Signup and view all the answers

    What is the main purpose of tubular secretion in the renal system?

    <p>Transport waste from filtrate to blood</p> Signup and view all the answers

    Which mechanism is extremely important in regulating acid-base balance in the body?

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

    More Like This

    Use Quizgecko on...
    Browser
    Open
    Browser
    Browser