WBR0387: Difference between revisions

Jump to navigation Jump to search
VisualWikitext
No edit summary
m (refreshing WBR questions)
 
(2 intermediate revisions by 2 users not shown)
Line 1: Line 1:
{{WBRQuestion
{{WBRQuestion
|QuestionAuthor={{Rim}}
|QuestionAuthor= {{YD}} (Reviewed by  {{YD}} and  {{AJL}})
|ExamType=USMLE Step 1
|ExamType=USMLE Step 1
|MainCategory=Physiology
|MainCategory=Physiology
Line 8: Line 8:
|MainCategory=Physiology
|MainCategory=Physiology
|SubCategory=Renal
|SubCategory=Renal
|MainCategory=Physiology
|MainCategory=Physiology
|MainCategory=Physiology
|MainCategory=Physiology
|MainCategory=Physiology
Line 20: Line 21:
|MainCategory=Physiology
|MainCategory=Physiology
|SubCategory=Renal
|SubCategory=Renal
|Prompt=A researcher is studying the role of aldosterone at the level of renal tubules. He conducts an experiment whereby he measures urinary concentration of sodium, potassium, and hydrogen before and after aldosterone administration. With respect to urinary concentrations before the administration of aldosterone, which of the following parameters is true for concentrations of urinary sodium, potassium, and hydrogen (in order) after aldosterone administration?
|Prompt=A researcher is studying the role of aldosterone at the level of renal tubules. He conducts an experiment whereby he measures urinary concentration of sodium, potassium, and hydrogen immediately prior and following aldosterone administration. With respect to urinary concentrations prior to the administration of aldosterone, which of the following parameters is true for the urinary concentrations of sodium, potassium, and hydrogen following aldosterone administration?<br>
[[Image:Urinary Electrolytes Aldosteron WBR.png|600px]]
[[Image:Urinary Electrolytes Aldosteron WBR.png|800px]]
|Explanation=Aldosterone accelerates the ion exchange of sodium for potassium or hydrogen. Aldosterone acts at the level of collecting ducts to reabsorb sodium, and excrete potassium and hydrogen. Thus, urinary concentrations of sodium will be decreased, while urinary concentrations of potassium and hydrogen will be increased.
|Explanation=[[Aldosterone]] accelerates the ion exchange of sodium for potassium and hydrogen. [[Aldosterone]] acts at the level of the collecting ducts to reabsorb sodium and excrete potassium and hydrogen. Thus, urinary concentrations of sodium will decrease, while urinary concentrations of potassium and hydrogen will increase.
 
|AnswerA=A
Educational Objective:
|AnswerAExp=An increase in the concentration of sodium, accompanied by a decrease in the concentration of potassium and hydrogen, occurs in the serum, not in urine.
Aldosterone acts on the renal collecting tubule.  It accelerates the ion exchange of sodium for potassium or hydrogen; allowing increased reabsorption of sodium and excretion of both potassium and hydrogen.
|AnswerB=B
|AnswerA=Increased - Decreased - Decreased
|AnswerBExp=Following [[aldosterone]] administration, the urinary concentration of sodium is decreased due to the reabsorption of sodium. On the other hand, the urinary concentration of hydrogen is increased due to the excretion of hydrogen.
|AnswerAExp=An increase in sodium, accompanied by a decrease in potassium and hydrogen, is seen in the serum, not in urine.
|AnswerC=C
|AnswerB=Increased - Increased - Decreased
|AnswerCExp=[[Aldosterone]] accelerates the ion exchange of sodium for potassium or hydrogen. It increases the reabsorption of sodium and the excretion of both potassium and hydrogen.
|AnswerBExp=Following aldosterone administration, urinary sodium is decreased due to aldsoterone’s activity in reabsorbing sodium, and urinary hydrogen is increased due to aldosterone’s activity in excreting hydrogen.
|AnswerD=D
|AnswerC=Decreased - Increased - Increased
|AnswerDExp=Following [[aldosterone]] administration, hydrogen is excreted into the urine, and urinary concentration of hydrogen is expected to increase.
|AnswerCExp=Aldosterone accelerates the ion exchange of sodium for potassium or hydrogen; allowing increased reabsorption of sodium and excretion of both potassium and hydrogen.
|AnswerE=E
|AnswerD=Decreased - Increased - Unchanged
|AnswerEExp=Following [[aldosterone]] administration, the urinary concentration of potassium increases whereas the serum concentration of potassium decreases due to aldosterone-mediated urinary excretion of potassium.
|AnswerDExp=Following aldosterone administration, hydrogen is excreted.  Its urinary concentration will be increased. It will not remain unchanged.
|EducationalObjectives=Aldosterone acts at the level of the renal collecting tubule. It accelerates the ion exchange of sodium (reabsorption) for potassium or hydrogen (excretion). Administration of aldosterone results in a decrease in the urinary concentration of sodium and an increase in the urinary concentration of potassium and hydrogen.
|AnswerE=Decreased - Decreased - Increased
|References=First Aid 2014 page 318, 528, 530
|AnswerEExp=Following aldosterone administration, urinary potassium increases, while serum potassium is decreased due to aldosterone’s activity in excreting potassium.
|RightAnswer=C
|RightAnswer=C
|Approved=No
|WBRKeyword=Aldosterone, Sodium, Potassium, Hydrogen, Reabsorption, Urinary concentration, Excretion, Collecting tubule
|Approved=Yes
}}
}}

Latest revision as of 00:24, 28 October 2020
Author [[PageAuthor::Yazan Daaboul, M.D. (Reviewed by Yazan Daaboul, M.D. and Alison Leibowitz [1])]]
Exam Type ExamType::USMLE Step 1
Main Category MainCategory::Physiology
Sub Category SubCategory::Renal
Prompt [[Prompt::A researcher is studying the role of aldosterone at the level of renal tubules. He conducts an experiment whereby he measures urinary concentration of sodium, potassium, and hydrogen immediately prior and following aldosterone administration. With respect to urinary concentrations prior to the administration of aldosterone, which of the following parameters is true for the urinary concentrations of sodium, potassium, and hydrogen following aldosterone administration?

]]

Answer A AnswerA::A
Answer A Explanation AnswerAExp::An increase in the concentration of sodium, accompanied by a decrease in the concentration of potassium and hydrogen, occurs in the serum, not in urine.
Answer B AnswerB::B
Answer B Explanation [[AnswerBExp::Following aldosterone administration, the urinary concentration of sodium is decreased due to the reabsorption of sodium. On the other hand, the urinary concentration of hydrogen is increased due to the excretion of hydrogen.]]
Answer C AnswerC::C
Answer C Explanation [[AnswerCExp::Aldosterone accelerates the ion exchange of sodium for potassium or hydrogen. It increases the reabsorption of sodium and the excretion of both potassium and hydrogen.]]
Answer D AnswerD::D
Answer D Explanation [[AnswerDExp::Following aldosterone administration, hydrogen is excreted into the urine, and urinary concentration of hydrogen is expected to increase.]]
Answer E AnswerE::E
Answer E Explanation [[AnswerEExp::Following aldosterone administration, the urinary concentration of potassium increases whereas the serum concentration of potassium decreases due to aldosterone-mediated urinary excretion of potassium.]]
Right Answer RightAnswer::C
Explanation [[Explanation::Aldosterone accelerates the ion exchange of sodium for potassium and hydrogen. Aldosterone acts at the level of the collecting ducts to reabsorb sodium and excrete potassium and hydrogen. Thus, urinary concentrations of sodium will decrease, while urinary concentrations of potassium and hydrogen will increase.

Educational Objective: Aldosterone acts at the level of the renal collecting tubule. It accelerates the ion exchange of sodium (reabsorption) for potassium or hydrogen (excretion). Administration of aldosterone results in a decrease in the urinary concentration of sodium and an increase in the urinary concentration of potassium and hydrogen.
References: First Aid 2014 page 318, 528, 530]]

Approved Approved::Yes
Keyword WBRKeyword::Aldosterone, WBRKeyword::Sodium, WBRKeyword::Potassium, WBRKeyword::Hydrogen, WBRKeyword::Reabsorption, WBRKeyword::Urinary concentration, WBRKeyword::Excretion, WBRKeyword::Collecting tubule
Linked Question Linked::
Order in Linked Questions LinkedOrder::
Retrieved from "https://www.wikidoc.org/index.php?title=WBR0387&oldid=1671642"