Busy. Please wait.
Log in with Clever

show password
Forgot Password?

Don't have an account?  Sign up 
Sign up using Clever

Username is available taken
show password

Make sure to remember your password. If you forget it there is no way for StudyStack to send you a reset link. You would need to create a new account.
Your email address is only used to allow you to reset your password. See our Privacy Policy and Terms of Service.

Already a StudyStack user? Log In

Reset Password
Enter the associated with your account, and we'll email you a link to reset your password.
Didn't know it?
click below
Knew it?
click below
Don't Know
Remaining cards (0)
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.

  Normal Size     Small Size show me how

une ch 28

formation and degradation of glycogen

glycogen synthesis f/s/p Fx: maintain blood glucose later(liver). glucose so you can use it for energy for contractions at a later time (muscle). Substrates: ATP, glucose, UTP Products: ADP, (glucose-6-phosphate is an intermediate), glycogen, pyrophosphate (PPi --> 2Pi), and U
glycogen synthesis c/r/c/t Control Enzyme: glycogen synthase Regulation: Insulin/Glucagon ratio and amount of glucose present (liver), epinephrine can also inhibit. Muscle insulin level (muscle). Compartment: cytosol tissues: liver and muscles
glycogenolysis (glycogen degradation)f/s/p Function: Provide blood glucose (liver). Provide glucose to produce energy for muscle contractions (muscle). Substrates: Glycogen, Free phosphates Products: free glucose and g-1-p or g-6-p
glycogenolysis (glycogen degradation)c/r/c/t Control: debrancher enzyme, glycogen phosphorylase Reg: G phosphorylase, also epi has an effect. (Phosphorylation activates control enzyme.) In muscle, GNL is regulated via activation of glycogen phosphorylase by [AMP], [Ca2+],presence of epi C: Cytosol
What is the effect of a high carbohydrate meal, fasting, or stress upon the blood concentrations of insulin, glucagon, and epinephrine? High Carb Meal: increased insulin, decreased cortisol, glucagon, and epinephrine. Fasting: decreased insulin, increased glucagon, epinephrine and cortisol rise slowly. Stress: insulin decreases and stress hormones go up.
What is the effect of a high carbohydrate meal upon blood glucose and the glucose in liver cells? Blood glucose levels will immediately increase. Insulin will rise and promote the uptake of glucose into the tissues. Glycogen synthesis will be activated and glycogen degradation will be inhibited.
What is the effect of changes in the insulin, blood glucose or epinephrine upon glycogen (GG) synthesis and glycogen degradation in muscle? GG Synth inc when insln inc and dec when insln dec. It inc when bglu up and dec when bglu down. Muscle GG stores stable at rest,during stress/exercise epi released into the blood which stimulates GNL to meet energy needs. glucagon=NO effect on muscles.
In order of their activation, be able to name and give the reason for the activation of all the intermediates in the cAMP cascade in liver. Glucagon ----> G-Proteins ----> Adenylate Cyclase --> cAMP --> (PKA)--> Phosphorylase Kinase --> Phosphorylase B --> Phosphorylase A -> G-1-P-> G-6-P-> Glucose At same time, active PKA phosphorylates gg synthase to its inactive form, thereby dec gg synth
Created by: carolanimal
Popular Biochemistry sets




Use these flashcards to help memorize information. Look at the large card and try to recall what is on the other side. Then click the card to flip it. If you knew the answer, click the green Know box. Otherwise, click the red Don't know box.

When you've placed seven or more cards in the Don't know box, click "retry" to try those cards again.

If you've accidentally put the card in the wrong box, just click on the card to take it out of the box.

You can also use your keyboard to move the cards as follows:

If you are logged in to your account, this website will remember which cards you know and don't know so that they are in the same box the next time you log in.

When you need a break, try one of the other activities listed below the flashcards like Matching, Snowman, or Hungry Bug. Although it may feel like you're playing a game, your brain is still making more connections with the information to help you out.

To see how well you know the information, try the Quiz or Test activity.

Pass complete!
"Know" box contains:
Time elapsed:
restart all cards