After a meal, glucose is absorbed from the small intestine, starting the following process. Blood glucose concentration increases.
The pancreas responds, secreting insulin into the bloodstream.
Insulin causes the liver to convert glucose to glycogen, reducing blood glucose.
The pancreas stops secreting insulin.
Low levels of glucose cause glucagon to be released.
Glucagon causes the liver to break down some of its stored glycogen to glucose, increasing blood glucose.
The graph below shows these changes over a 9-hour period.
QUESTION
At point A on the graph, (select insulin, glucagon, glycogen, or glucose) is turning into (select insulin, glucagon, glycogen, or glucose)