Chapter 17, Problem 31RQ

Which of the following statements about insulin is true?

1. Insulin acts as a transport protein, cany in g glucose across the cell membrane.
2. Insulin facilitates the movement of inti acellular glucose transporters to the cell membrane.
3. Insulin stimulates the breakdown of stored glycogen into glucose.
4. Insulin stimulates the kidneys to reabsorb glucose into the bloodstream.