How well do you know glycogen phosphorylation in skeletal muscles?

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Questions and Answers

What is the purpose of the bicyclic control system for the phosphorylation of glycogen phosphorylase?

  • To store more glycogen in the muscles
  • To slow down the mobilization of glycogen
  • To prevent the mobilization of glycogen
  • To amplify a small initial signal for rapid glycogen mobilization (correct)

What is the result of epinephrine binding to β-adrenergic receptors on the surface of muscle cells?

  • Release of glucose into the bloodstream
  • Preservation of glycogen in the muscles
  • Mobilization of stored glycogen (correct)
  • Activation of glucagon receptors

Why don't muscles release glucose into the bloodstream?

  • Muscles lack glucagon receptors (correct)
  • Muscles lack β-adrenergic receptors
  • Muscles lack hexokinase
  • Muscles lack glycogen phosphorylase

What is the role of hexokinase in muscle cells?

<p>To phosphorylate and use glucose immediately once it's formed (A)</p> Signup and view all the answers

What is the identical cascade of events that occurs in skeletal muscles?

<p>Epinephrine binding to β-adrenergic receptors (C)</p> Signup and view all the answers

What is the result of the amplification of a small initial signal in the bicyclic control system?

<p>Rapid mobilization of all stored glycogen (D)</p> Signup and view all the answers

What is the purpose of preserving glycogen in the muscles?

<p>To enable movement (D)</p> Signup and view all the answers

What is the result of the induction of the cascade in skeletal muscles?

<p>Mobilization of stored glucose (D)</p> Signup and view all the answers

What is the role of β-adrenergic receptors in muscle cells?

<p>To activate the cascade of events that leads to glycogen mobilization (C)</p> Signup and view all the answers

What is the result of the phosphorylation of glycogen phosphorylase?

<p>Rapid mobilization of all stored glycogen (D)</p> Signup and view all the answers

What is the purpose of the bicyclic control system for the phosphorylation of glycogen phosphorylase?

<p>To amplify a small initial signal for rapid glycogen mobilization (A)</p> Signup and view all the answers

What is the result of epinephrine binding to β-adrenergic receptors on the surface of muscle cells?

<p>Mobilization of stored glycogen (C)</p> Signup and view all the answers

Why don't muscles release glucose into the bloodstream?

<p>Muscles lack glucagon receptors (B)</p> Signup and view all the answers

What is the role of hexokinase in muscle cells?

<p>To phosphorylate and use glucose immediately once it's formed (C)</p> Signup and view all the answers

What is the identical cascade of events that occurs in skeletal muscles?

<p>Epinephrine binding to β-adrenergic receptors (D)</p> Signup and view all the answers

What is the result of the amplification of a small initial signal in the bicyclic control system?

<p>Rapid mobilization of all stored glycogen (B)</p> Signup and view all the answers

What is the purpose of preserving glycogen in the muscles?

<p>To enable movement (D)</p> Signup and view all the answers

What is the result of the induction of the cascade in skeletal muscles?

<p>Mobilization of stored glucose (A)</p> Signup and view all the answers

What is the role of β-adrenergic receptors in muscle cells?

<p>To activate the cascade of events that leads to glycogen mobilization (C)</p> Signup and view all the answers

What is the result of the phosphorylation of glycogen phosphorylase?

<p>Rapid mobilization of all stored glycogen (B)</p> Signup and view all the answers

Which of the following is the reason for the existence of a bicyclic control system for the phosphorylation of glycogen phosphorylase?

<p>To mobilize all stored glycogen within seconds (B)</p> Signup and view all the answers

What is the result of epinephrine binding to β-adrenergic receptors on the surface of muscle cells?

<p>Induction of the cascade of events in skeletal muscles (C)</p> Signup and view all the answers

Why don't muscles release glucose into the bloodstream?

<p>Muscles don't have glucagon receptors (A)</p> Signup and view all the answers

What is the function of a bicyclic control system for the phosphorylation of glycogen phosphorylase?

<p>To mobilize all stored glycogen within seconds (B)</p> Signup and view all the answers

What is the identical cascade of events that occurs in skeletal muscles?

<p>Mobilization of all stored glycogen within seconds (B)</p> Signup and view all the answers

What is the result of epinephrine binding to β-adrenergic receptors in liver cells?

<p>Release of glucose into the bloodstream (C)</p> Signup and view all the answers

What is the reason that muscles don't have glucagon receptors?

<p>To preserve glycogen in the muscles (C)</p> Signup and view all the answers

What is the role of hexokinase in the muscles?

<p>To phosphorylate and use glucose immediately once it’s formed (C)</p> Signup and view all the answers

What is the reason for the existence of a bicyclic control system for the phosphorylation of glycogen phosphorylase in the liver?

<p>To release glucose into the bloodstream (C)</p> Signup and view all the answers

What is the reason that skeletal muscles don't release glucose into the bloodstream?

<p>To preserve glycogen in the muscles (A)</p> Signup and view all the answers

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