how do glucagon and insulin differ? identify all of the statements below that are true. how do glucagon and insulin differ?identify all of the statements below that are true. insulin acts only on skeletal muscle cells, whereas glucagon acts only on liver cells. insulin is secreted from the pancreas, whereas glucagon is secreted from the liver. insulin causes some cells to take up glucose, whereas glucagon causes some cells to secrete glucose. insulin is secreted when the blood glucose level is low, whereas glucagon is secreted when the blood glucose level is high.