Lowest Afferent/Efferent Renal Arteriolar Ratio! - USMLE Forums
USMLE Forums Logo
USMLE Forums         Your Reliable USMLE Online Community     Members     Posts
Home
USMLE Articles
USMLE News
USMLE Polls
USMLE Books
USMLE Apps
Go Back   USMLE Forums > USMLE Step 1 Forum

USMLE Step 1 Forum USMLE Step 1 Discussion Forum: Let's talk about anything related to USMLE Step 1 exam


Reply
 
Thread Tools Search this Thread Display Modes
  #1  
Old 07-03-2011
jahn77's Avatar
USMLE Forums Guru
 
Steps History: Step 1 Only
Posts: 326
Threads: 20
Thanked 220 Times in 124 Posts
Reputation: 232
Kidney Lowest Afferent/Efferent Renal Arteriolar Ratio!

Using laboratory micropuncture technique, blood plasma is collected from arteriole and efferent arteriole of a renal cortical glomerulus. Which of the following has the lowest afferent/efferent arteriole concentration ratio?

(A) albumin
(B) chloride
(C) glucose
(D) potassium
(E) sodium
Reply With Quote Quick reply to this message
The above post was thanked by:
bebix (07-04-2011), Claus_CU (07-04-2011), docji (07-04-2011), drfchakera (07-06-2011), INCOGNITO (07-04-2011), Mashee (07-04-2011), pass7 (07-04-2011), star123 (07-04-2011), struggle (07-04-2011), usluipek (07-04-2011)



  #2  
Old 07-04-2011
pnreddy's Avatar
USMLE Forums Scout
 
Steps History: Step 1 Only
Posts: 76
Threads: 3
Thanked 48 Times in 35 Posts
Reputation: 58
Default

is it a
Reply With Quote Quick reply to this message
  #3  
Old 07-04-2011
Mashee's Avatar
USMLE Forums Addict
 
Steps History: 1+CK+CS
Posts: 147
Threads: 9
Thanked 99 Times in 61 Posts
Reputation: 109
Default

i think its a) Albumin...cuz a low ratio wud mean that less filtered out...and albumin is definitely not filtered out..
Reply With Quote Quick reply to this message
The above post was thanked by:
struggle (07-04-2011)
 
  #4  
Old 07-04-2011
bebix's Avatar
USMLE Forums Master
 
Steps History: 1+CK+CS+3
Posts: 1,357
Threads: 194
Thanked 3,261 Times in 881 Posts
Reputation: 3271
Default

Answer is A)

lowest afferent/efferent arteriole concentration ratio = [] AE > [] AA...
Normal Kidney = filtrate only includes small molecules and water...albumin is NOT filtered = [] Albumin AE > [] Albumin AA.
Reply With Quote Quick reply to this message
The above post was thanked by:
Claus_CU (07-04-2011), drfchakera (07-06-2011), INCOGNITO (07-04-2011), struggle (07-04-2011)
  #5  
Old 07-04-2011
USMLE Forums Veteran
 
Steps History: ---
Posts: 253
Threads: 20
Thanked 43 Times in 39 Posts
Reputation: 53
Default

yep, i agree with A
Reply With Quote Quick reply to this message
  #6  
Old 07-04-2011
USMLE Forums Scout
 
Steps History: Step 1 Only
Posts: 32
Threads: 7
Thanked 9 Times in 5 Posts
Reputation: 19
Default

these are the type of questions which leave u mind boggled..coz i think it cant be albumin due to this argument...

AA/AE for albumins is goin to be 0/0. there is no albumin at either of the places. but talking about Na, K they are reabsorbed in a greater quantity than chloride.. and so i guess its gotta be chloride.
Reply With Quote Quick reply to this message
  #7  
Old 07-04-2011
bebix's Avatar
USMLE Forums Master
 
Steps History: 1+CK+CS+3
Posts: 1,357
Threads: 194
Thanked 3,261 Times in 881 Posts
Reputation: 3271
Default

Quote:
Originally Posted by liaison4fun View Post
these are the type of questions which leave u mind boggled..coz i think it cant be albumin due to this argument...

AA/AE for albumins is goin to be 0/0. there is no albumin at either of the places. but talking about Na, K they are reabsorbed in a greater quantity than chloride.. and so i guess its gotta be chloride.
since we are collecting blood plasma and not UF...the albumin [] shouldnt be 0...
Reply With Quote Quick reply to this message
  #8  
Old 07-04-2011
jahn77's Avatar
USMLE Forums Guru
 
Steps History: Step 1 Only
Posts: 326
Threads: 20
Thanked 220 Times in 124 Posts
Reputation: 232
Correct Answer Correct answer - A

A - albumin is correct answer;
mechanism ->> even the absolute amount is the same in afferent and efferent parts, its concentration is higher in efferent artery due to filtration of water and small molecules (more concentrated blood).
Reply With Quote Quick reply to this message
The above post was thanked by:
awaisnaeem86 (07-05-2011), bebix (07-04-2011), Claus_CU (07-04-2011), docji (07-04-2011), INCOGNITO (07-05-2011), Mashee (07-04-2011), palpitation (07-05-2011), rafa_decosta (05-23-2013), rulz (07-05-2011), struggle (07-04-2011), usluipek (07-05-2011)
  #9  
Old 07-05-2011
USMLE Forums Scout
 
Steps History: Step 1 Only
Posts: 32
Threads: 7
Thanked 9 Times in 5 Posts
Reputation: 19
Default

Quote:
Originally Posted by bebix View Post
since we are collecting blood plasma and not UF...the albumin [] shouldnt be 0...
loll...my bad. somehow i tend to read unintended words in the place of the those actually asked in questions. in most of questions we are normally asked about the conc in the pct and dct and that is wat i sort of told myself was being asked..had i opened my eyes (metaphorical) a little more i'd have understood..yeh it is albumin. the explaination i had earlier given was pertaining to pct and dct...
Reply With Quote Quick reply to this message



Reply

Tags
Physiology-, Renal-, Step-1-Questions

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the USMLE Forums forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:
Medical School
Choose "---" if you don't want to tell. AMG for US & Canadian medical schools. IMG for all other medical schools.
USMLE Steps History
What steps finished! Example: 1+CK+CS+3 = Passed Step 1, Step 2 CK, Step 2 CS, and Step 3.

Choose "---" if you don't want to tell.

Favorite USMLE Books
What USMLE books you really think are useful. Leave blank if you don't want to tell.
Location
Where you live. Leave blank if you don't want to tell.

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes


Similar Threads
Thread Thread Starter Forum Replies Last Post
Renal Toxin effect on GFR and arteriolar resistance! bebix USMLE Step 1 Forum 9 07-02-2011 07:57 PM
If the precapillary arteriolar resistance increases! Dr_Kal_El USMLE Step 1 Forum 2 06-12-2011 10:47 PM
Pediatrics Lowest Income and Orthopedics is the highest income in USA! Syndromic IMG Residency Match Forum 15 05-30-2011 10:24 AM
The Effect of Efferent Arteriole Dilation on GFR? bigal USMLE Step 1 Forum 2 05-17-2011 08:57 AM
Arteriolar Constriction in Hypertension intam USMLE Step 1 Forum 2 10-03-2009 04:58 PM

RSS Feed
Find Us on Facebook
vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.

USMLE® & other trade marks belong to their respective owners, read full disclaimer
USMLE Forums created under Creative Commons 3.0 License. (2009-2014)