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une ch 28
formation and degradation of glycogen
| Question | Answer |
|---|---|
| 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 |
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carolanimal
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