Difference between revisions of "Reabsorption and Secretion Along the Loop of Henle - Renal Flash Cards - Anatomy & Physiology"

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|maplink = Urinary System (Content Map) - Anatomy & Physiology
 
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'''Use the mouse to highlight the answers.  They are written in white'''
 
'''Use the mouse to highlight the answers.  They are written in white'''
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<TABLE BORDER="2" BORDERCOLOR="#6600FF" CELLPADDING="2" CELLSPACING="2" WIDTH="80%">
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<TR>
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<TD>'''Question'''</TD>
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<TD>'''Answer'''</TD>
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<TD>'''Link'''</TD>
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</TR>
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<TR>
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<TD>Which of the three limbs has active transport?</TD>
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<TD><FONT  COLOR="#FFFFFF">
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The thick ascending limb</font></TD>
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<TD>[[Reabsorption and Secretion Along the Loop of Henle - Anatomy & Physiology#Thick ascending limb|Link]]</TD>
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</TR>
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<TR>
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<TD>What system of reabsorption is used in the loop of henle?</TD>
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<TD><FONT  COLOR="#FFFFFF">
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Countercurrent multiplier</font></TD>
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<TD>[[Reabsorption and Secretion Along the Loop of Henle - Anatomy & Physiology#Countercurrent System|Link]]</TD>
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</TR>
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<TR>
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<TD>Explain how the countercurrent multiplier works?</TD>
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<TD><FONT  COLOR="#FFFFFF">
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* "Descending limb is permeable to water but not solutes"
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* "The thick ascending loop is not permeable to water but solutes are pumped out"
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* "Therefore, osmolarity of peritubular space is elevated, which draws water out of the descending limb"
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* "Therefore, solute concentration of the fluid in the ascending limb is higher... causing more pumping"
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* "Therefore, osmolarity of peritubular space is elevated, which draws more water out of descending limb"
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'''''Courtesy of Dr Ali Mobasheri <small>(University of Nottingham School of Veterinary Medicine and Science)</small>'''''</font></TD>
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<TD>[[Reabsorption and Secretion Along the Loop of Henle - Anatomy & Physiology#Countercurrent System|Link]]</TD>
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</TR>
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<TR>
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<TD>What happens to the concentration of the tubular fluid as it passes around the loop?</TD>
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<TD><FONT  COLOR="#FFFFFF">
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The concentration increases as it descends as water leaves the tubule. However as the fluid ascends the other side ions are transported out causing the concentration to decrease.  By the end of the loop the concentration is the same as at the start but the volume is greatly reduced.  </font></TD>
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<TD>[[Reabsorption and Secretion Along the Loop of Henle - Anatomy & Physiology#Countercurrent System|Link]]</TD>
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</TR>
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<TR>
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<TD>Why is the gradient within the medulla not removed by the vasa recta?</TD>
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<TD><FONT  COLOR="#FFFFFF">
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It is also set up as a countercurrent system.  Lots of ions enter as it passes down into the medulla as the interstitium become more concentrated but these all leave as it rises back out of the medulla as the interstitium becomes less so.</font></TD>
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<TD>[[Reabsorption and Secretion Along the Loop of Henle - Anatomy & Physiology#Vasa Recta Physiology|Link]]</TD>
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</TR>
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</table>
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[[Category:Urine Production]][[Category:Urinary System Anatomy & Physiology Flashcards]]

Latest revision as of 17:21, 21 June 2011

Use the mouse to highlight the answers. They are written in white

Question Answer Link
Which of the three limbs has active transport? The thick ascending limb Link
What system of reabsorption is used in the loop of henle? Countercurrent multiplier Link
Explain how the countercurrent multiplier works?
  • "Descending limb is permeable to water but not solutes"
  • "The thick ascending loop is not permeable to water but solutes are pumped out"
  • "Therefore, osmolarity of peritubular space is elevated, which draws water out of the descending limb"
  • "Therefore, solute concentration of the fluid in the ascending limb is higher... causing more pumping"
  • "Therefore, osmolarity of peritubular space is elevated, which draws more water out of descending limb"
Courtesy of Dr Ali Mobasheri (University of Nottingham School of Veterinary Medicine and Science)		 Link
What happens to the concentration of the tubular fluid as it passes around the loop? The concentration increases as it descends as water leaves the tubule. However as the fluid ascends the other side ions are transported out causing the concentration to decrease. By the end of the loop the concentration is the same as at the start but the volume is greatly reduced. Link
Why is the gradient within the medulla not removed by the vasa recta? It is also set up as a countercurrent system. Lots of ions enter as it passes down into the medulla as the interstitium become more concentrated but these all leave as it rises back out of the medulla as the interstitium becomes less so. Link
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