What happens next after the hormone glucagon binds to a g-protein coupled receptor (gpcr)?

Glucagon acts on the receptors of the liver cell. The gpcr include a internal signaling in the cell following the heterotrimeric G-proteins dissociates. It activates a pathway that results in the breakdown of glycogen to glucose or the de novo synthesis of glucose in the cells.

sodium i think the chemical element of atomic number 11, a soft silver-white reactive metal of the alkali metal group.

the answer is lactic acid from anaerobic respiration. the acid in lactic acid is what creates sore and burning muscles. if you think about how acid burns that will give you a clue for questions like this.