Starvation after day 3 - 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 09-27-2011
USMLE Forums Scout
 
Steps History: ---
Posts: 29
Threads: 12
Thanked 9 Times in 4 Posts
Reputation: 19
Default Starvation after day 3

As I know after 3 days of starvation body use adipose stores in form os ketone bodies/ acetoacetate, beta-hydroxybutyrate and acetone/ which become the main source of energy for the brain. So amount of adipose stores determines survival time..Can someone explain in more details how does it goes?
Reply With Quote Quick reply to this message



  #2  
Old 09-27-2011
DocSikorski's Avatar
USMLE Forums Master
 
Steps History: 1+CK+CS+3
Posts: 1,353
Threads: 94
Thanked 873 Times in 506 Posts
Reputation: 886
Default

The final survival time would be determined by the lysis of muscle tissue.
But until than, body uses adipose tissue to form ketones to supply most of the organs and systems. But brain and erythrocytes do require glucose for survival, so there is formation of ketone bodies and glycogenolysis in liver mainly and gluconeogenesis.
__________________
Ambition is a dream with a V8 engine. EP
Reply With Quote Quick reply to this message
  #3  
Old 09-27-2011
USMLE Forums Scout
 
Steps History: ---
Posts: 29
Threads: 12
Thanked 9 Times in 4 Posts
Reputation: 19
Default

so you say that glucagon activates glyserol utilization as a source of carbon for gluconeogenesis by adipocytes??
Reply With Quote Quick reply to this message
  #4  
Old 09-27-2011
USMLE Forums Scout
 
Steps History: Not yet
Posts: 48
Threads: 18
Thanked 12 Times in 9 Posts
Reputation: 22
Default

I do not have my FA on me right now, but I thought after awhile your body uses the stored fat and breaks down odd chain fatty acids for the source for ketone formation. Does gluconeogenesis still take place when you have ketone production? Or do both happen during an intermediate phase where you are switching in between short term starvation to prolong starvation?
Reply With Quote Quick reply to this message
  #5  
Old 09-28-2011
USMLE Forums Scout
 
Steps History: Not yet
Posts: 14
Threads: 5
Thanked 3 Times in 3 Posts
Reputation: 13
Default

As I understand it, the body uses the glucogen in the liver first. When those deposits are empty, it begins both gluconeogenesis and ketone formation. Why? Because while most of the organs in the body can use ketone bodies for energy, neither the erythrocytes nor the brain can. So you need to have glucose. Which comes from the aa via gluconeogenesis. I think both are regulated via glucagon.
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
Effect of Starvation Diet sam01 USMLE Step 1 Forum 10 08-15-2011 10:26 PM
Very Useful Biochemistry Table; Liver, Muscle, Heart, Fat, and Brain Sources of energy in fed state and in starvation Hope2Pass USMLE Step 1 Bits & Pieces 1 05-15-2011 02:19 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)