Hormonal Regulation
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Questions and Answers

Which enzyme is activated by adenylyl cyclase in the liver during low blood glucose levels?

  • Protein kinase A
  • Glycogen synthase
  • Phosphorylase kinase (correct)
  • Glycogen phosphorylase

    • What is the effect of PKA on phosphorylase kinase?

  • It inactivates the 'b' form and produces the 'a' form. (correct)
  • It inactivates the 'a' form and produces the 'b' form.
  • It activates the 'b' form and produces the 'a' form.
  • It activates the 'a' form and produces the 'b' form.

    • What is the function of phosphorylase kinase in glycogen breakdown?

  • It phosphorylates and inactivates glycogen phosphorylase.
  • It phosphorylates and activates glycogen phosphorylase. (correct)
  • It phosphorylates and activates glycogen synthase.
  • It phosphorylates and inactivates glycogen synthase.

    • What is the role of glucagon in hormonal regulation of glycogen breakdown?

    <p>It activates adenylyl cyclase in the liver.</p> Signup and view all the answers

    What is the effect of cAMP on PKA during hormonal regulation of glycogen breakdown?

    <p>It activates PKA.</p> Signup and view all the answers

    What is the function of glycogen phosphorylase in glycogen breakdown?

    <p>It breaks down glycogen into glucose-6-phosphate.</p> Signup and view all the answers

    What is the effect of phosphorylation on the activity of phosphorylase kinase?

    <p>It inactivates the 'b' form and activates the 'a' form.</p> Signup and view all the answers

    What is the effect of insulin on glycogen breakdown?

    <p>It inhibits glycogen breakdown.</p> Signup and view all the answers

    What is the effect of low blood glucose levels on glucagon secretion?

    <p>It stimulates glucagon secretion.</p> Signup and view all the answers

    What is the effect of PKA on glycogen synthase during hormonal regulation of glycogen breakdown?

    <p>It inhibits glycogen synthase.</p> Signup and view all the answers

    What is the effect of phosphorylation on the activity of glycogen phosphorylase?

    <p>It activates the 'a' form and inactivates the 'b' form.</p> Signup and view all the answers

    What is the effect of glucagon on insulin secretion during hormonal regulation of glycogen breakdown?

    <p>It inhibits insulin secretion.</p> Signup and view all the answers

    Which enzyme is activated by adenylyl cyclase in the liver during low blood glucose levels?

    <p>Phosphorylase kinase</p> Signup and view all the answers

    What is the effect of PKA on phosphorylase kinase?

    <p>It inactivates the 'b' form and produces the 'a' form.</p> Signup and view all the answers

    What is the function of phosphorylase kinase in glycogen breakdown?

    <p>It phosphorylates and activates glycogen phosphorylase.</p> Signup and view all the answers

    What is the role of glucagon in hormonal regulation of glycogen breakdown?

    <p>It activates adenylyl cyclase in the liver.</p> Signup and view all the answers

    What is the effect of cAMP on PKA during hormonal regulation of glycogen breakdown?

    <p>It activates PKA.</p> Signup and view all the answers

    What is the function of glycogen phosphorylase in glycogen breakdown?

    <p>It breaks down glycogen into glucose-6-phosphate.</p> Signup and view all the answers

    What is the effect of phosphorylation on the activity of phosphorylase kinase?

    <p>It inactivates the 'b' form and activates the 'a' form.</p> Signup and view all the answers

    What is the effect of insulin on glycogen breakdown?

    <p>It inhibits glycogen breakdown.</p> Signup and view all the answers

    What is the effect of low blood glucose levels on glucagon secretion?

    <p>It stimulates glucagon secretion.</p> Signup and view all the answers

    What is the effect of PKA on glycogen synthase during hormonal regulation of glycogen breakdown?

    <p>It inhibits glycogen synthase.</p> Signup and view all the answers

    What is the effect of phosphorylation on the activity of glycogen phosphorylase?

    <p>It activates the 'a' form and inactivates the 'b' form.</p> Signup and view all the answers

    What is the effect of glucagon on insulin secretion during hormonal regulation of glycogen breakdown?

    <p>It inhibits insulin secretion.</p> Signup and view all the answers

    Which enzyme is activated by adenylyl cyclase in response to low blood glucose levels?

    <p>Protein kinase A</p> Signup and view all the answers

    What is the inactive form of phosphorylase kinase called?

    <p>b form</p> Signup and view all the answers

    What is the net result of the activation of glycogen phosphorylase?

    <p>Rapid activation of glycogen breakdown</p> Signup and view all the answers

    What is the role of glucagon in the hormonal regulation of glucose levels?

    <p>It activates adenylyl cyclase in the liver</p> Signup and view all the answers

    What is the role of cAMP in the hormonal regulation of glucose levels?

    <p>It activates protein kinase A</p> Signup and view all the answers

    What is the active form of phosphorylase kinase called?

    <p>a form</p> Signup and view all the answers

    What is the enzyme that is phosphorylated by PKA in the hormonal regulation of glucose levels?

    <p>Phosphorylase kinase</p> Signup and view all the answers

    What is the result of PKA phosphorylating the inactive “b” form of phosphorylase kinase?

    <p>Production of the active “a” form of phosphorylase kinase</p> Signup and view all the answers

    What is the role of phosphorylase kinase in the hormonal regulation of glucose levels?

    <p>It activates glycogen phosphorylase</p> Signup and view all the answers

    What is the enzyme that is activated by phosphorylase kinase in the hormonal regulation of glucose levels?

    <p>Glycogen phosphorylase</p> Signup and view all the answers

    What is the result of the activation of glycogen phosphorylase in the hormonal regulation of glucose levels?

    <p>Rapid activation of glycogen breakdown</p> Signup and view all the answers

    What is the role of insulin in the hormonal regulation of glucose levels?

    <p>It stimulates glucose uptake by cells</p> Signup and view all the answers

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