If cAMP levels are high
(I)Glycogenolysis will occur in muscle cells but not liver cells.
(II)Glucose released from muscle glycogen will enter glycolysis.
(III)Glucose released from liver glycogen will exit liver cells via the GLUT4 transporter.
(IV)Glucose will enter liver cells resulting in glycogen synthesis.
A)I,II,IV
B)I,II
C)II,III,IV
D)II only
E)III only

Question

Quizplus · Accepted Answer

If cAMP levels are high, it will activate protein kinase A which will phosphorylate and activate enzymes involved in glycogenolysis in both muscle and liver cells. Therefore, (I) is true for both muscle and liver cells. However, (III) is incorrect as glucose released from liver glycogen will enter into the bloodstream and not through GLUT4 transporter. (IV) is also incorrect as high cAMP levels stimulate glycogen breakdown rather than glycogen synthesis. (II) is the only true statement as glucose released from muscle glycogen will enter glycolysis to provide energy for the muscle cell.

If CAMP Levels Are High