Really Good Question!!! - 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 04-17-2014
USMLE Forums Addict
 
Steps History: ---
Posts: 123
Threads: 28
Thanked 46 Times in 30 Posts
Reputation: 56
Default Really Good Question!!!

Q) A 35 year old research scientist spends 3 months on Skylab, a research lab on the International Space Station. Which of the following changes can be seen in his blood ?

A. Increased HR, Increased Na+, Increased viscosity
B. Increased HR, Decreased Na+, Increased viscosity
C. Increased HR, Increased Na+, Decreased viscosity
D. Increased HR, Decreased Na+, Decreased viscosity
D. Decreased HR, Increased Na+, Increased viscosity
E. Decreased HR, Decreased Na+, Increased viscosity
F. Decreased HR, Decreased Na+, Decreased viscosity

P.S.- I wrote this Question........
Reply With Quote Quick reply to this message
The above post was thanked by:
dr_kg (04-17-2014)



  #2  
Old 04-17-2014
USMLE Forums Addict
 
Steps History: 1 + CK
Posts: 148
Threads: 40
Thanked 10 Times in 9 Posts
Reputation: 20
Default

i think answer is C
Reply With Quote Quick reply to this message
  #3  
Old 04-18-2014
USMLE Forums Scout
 
Steps History: Step 1 Only
Posts: 69
Threads: 3
Thanked 111 Times in 16 Posts
Reputation: 121
Default

decreased HR decreased Na increased viscosity?
Reply With Quote Quick reply to this message
 
  #4  
Old 04-18-2014
USMLE Forums Addict
 
Steps History: 1 + CK
Posts: 148
Threads: 40
Thanked 10 Times in 9 Posts
Reputation: 20
Default

SCUBBY your answer is wrong,,,,,,
Reply With Quote Quick reply to this message
  #5  
Old 04-18-2014
USMLE Forums Addict
 
Steps History: 1 + CK
Posts: 148
Threads: 40
Thanked 10 Times in 9 Posts
Reputation: 20
Default

bcoz blood is distributed all over body, so less senitisation of pressure recptors results in increase HR, AND DECRESED BP presuire increaseSS SODIUM RETENTION,,,AND HEMATOPOTIC SYSTEM IS SUPPRESSED WEN U R IN SPACE FOR LONGF TYM,,, N JOYY
Reply With Quote Quick reply to this message
  #6  
Old 04-18-2014
USMLE Forums Addict
 
Steps History: Not yet
Posts: 158
Threads: 31
Thanked 35 Times in 33 Posts
Reputation: 45
Default

I feel like it might be A.

First he doesn't have enough oxygen so that means his EPO will be low so it will lead to an increase viscosity by producing more RBC.

Since his blood is more viscous I think it might add to his osm so increase in Na.

And it will in turn lead to increase RAAS. So increase blood pressure due to increase is Ang 2.

I could probably be wrong.

Reply With Quote Quick reply to this message
  #7  
Old 04-18-2014
USMLE Forums Master
 
Steps History: 1+CK+CS+3
Posts: 1,109
Threads: 31
Thanked 521 Times in 394 Posts
Reputation: 540
Default

I think it's A
__________________
In USMLE, “Any fool can know. The point is to understand.”
Reply With Quote Quick reply to this message
  #8  
Old 04-18-2014
USMLE Forums Scout
 
Steps History: Step 1 Only
Posts: 69
Threads: 3
Thanked 111 Times in 16 Posts
Reputation: 121
Default It's Subby not Scubby

Quote:
Originally Posted by kamidi View Post
bcoz blood is distributed all over body, so less senitisation of pressure recptors results in increase HR, AND DECRESED BP presuire increaseSS SODIUM RETENTION,,,AND HEMATOPOTIC SYSTEM IS SUPPRESSED WEN U R IN SPACE FOR LONGF TYM,,, N JOYY

Ok here is my reasoning, when on earth a large proportion of blood is pooled in gravity dependant areas which are veins of the leg etc. Basically there is pooling in the lower half of the body.

When in space there is ZERO gravity, follow me on this point here ZERO GRAVITY so blood is more equally distributed in the body. Since now an increased volume of blood will redistribute towards the upper half the body as there is no gravity to pool it in the lower half, the Barroreceptors will feel as if the patient is hypertensive so they will compensate by decreasing the heart rate?
so Heart Rate will decrease

Secondly as a greater volume of blood redistributes from the lower limb veins to the upper half of the body, venous return will increase which will cause increased stretch on the Atria which in turn will release Atrial Naturetic Peptide the body will go into Diuresis and Sodium concentration shall be low.
so low Na concentration

Lastly as sodium leaves the body, water will follow and thus the viscosity of the blood will increase. As decreased water content of blood = increased viscosity.
So Viscosity will be higher

Hope i got it right
Reply With Quote Quick reply to this message
  #9  
Old 04-18-2014
USMLE Forums Addict
 
Steps History: 1 + CK
Posts: 148
Threads: 40
Thanked 10 Times in 9 Posts
Reputation: 20
Default

http://www.racetomars.ca/mars/article_effects.jsp
Reply With Quote Quick reply to this message



Reply

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
235 step 1 : Good enough for anesthesia? good enough for IM? Juanthebaptist IMG Residency Match Forum 2 10-24-2014 04:44 AM
Good Samaritan Law question Casandra USMLE Step 1 Forum 13 06-04-2012 07:38 AM
The Good, the Bad and the Ugly. (A thought on a good USMLE-type question) DocSikorski USMLE Step 1 Forum 1 05-09-2012 09:01 AM
A good article on how to put together a good study plan justfree USMLE Links & Free Ads 0 06-13-2011 08:29 AM
what are some good step 1 question books?? saty_montana USMLE Step 1 Forum 2 08-27-2010 04:55 AM

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)