Explain why an increase in glycogen phosphorylase activity might result in an increase in pyruvate production in the cell.

Explanation:

In muscle, glycogen phosphorylase is activated by hormones and neural signals such as epinephrine, that stimulate phosphorylase kinase which phosphorylates the Ser-14 residue of the protein. ... The activated kinase in turn activates the glycogen phosphorylase enzyme by phosphorylating the Ser-14 residue.