Renal Tubules and Tubular Reabsorption and Secretion
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Questions and Answers

What is the primary function of the renin-angiotensin-aldosterone system in blood pressure regulation?

  • To regulate electrolyte balance
  • To increase blood volume and pressure (correct)
  • To decrease blood volume and pressure
  • To stimulate the hypothalamic thirst center

    • What is the effect of angiotensin II on the adrenal cortex?

  • It stimulates the release of aldosterone (correct)
  • It stimulates the release of ADH
  • It has no effect on the adrenal cortex
  • It inhibits the release of aldosterone

    • What is the role of the granular cells in the renin-angiotensin-aldosterone system?

  • They release aldosterone
  • They release angiotensin II
  • They release renin (correct)
  • They convert angiotensin I to angiotensin II

    • What is the effect of increased angiotensin II on the hypothalamus?

    <p>It stimulates the release of ADH and activates the thirst center (B)</p> Signup and view all the answers

    What is the normal net filtration pressure in the glomerulus?

    <p>15 mmHg (B)</p> Signup and view all the answers

    What is the effect of high sodium concentration in the filtrate on the afferent arteriole?

    <p>It dilates the afferent arteriole (A)</p> Signup and view all the answers

    What is the purpose of autoregulation mechanisms in the kidneys?

    <p>To maintain a constant GFR (D)</p> Signup and view all the answers

    What is the effect of sympathetic nervous system activation on the afferent arteriole?

    <p>It constricts the afferent arteriole (D)</p> Signup and view all the answers

    What is GFR?

    <p>The amount of blood filtered by the kidneys per minute (D)</p> Signup and view all the answers

    What is the normal blood pressure in the glomerulus?

    <p>140 mmHg (A)</p> Signup and view all the answers

    Flashcards

    Renin-angiotensin-aldosterone system's main function

    Raises blood volume and pressure

    Angiotensin II effect on adrenal cortex

    Triggers aldosterone release

    Granular cells' role

    Release renin

    Angiotensin II's effect on hypothalamus

    Stimulates ADH release and thirst

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    Glomerular net filtration pressure (normal)

    15 mmHg

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    High filtrate sodium effect on afferent arteriole

    Dilates the afferent arteriole.

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    Autoregulation in kidneys' purpose

    Maintains constant GFR

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    Sympathetic system effect on afferent arteriole

    Constricts the arteriole

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    GFR definition

    Blood filtered by kidneys per minute

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    Glomerular blood pressure (normal)

    140 mmHg

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