- Which of the following statements about insulin is true?
- A. Insulin acts as a transport protein, carrying glucose across the cell membrane.
- B. Insulin facilitates the movement of intracellular glucose transporters to the cell membrane.
- C. Insulin stimulates the breakdown of stored glycogen into glucose.
- D. Insulin stimulates the kidneys to reabsorb glucose into the bloodstream.
- E. Two of the above are true statements.
Answer
- B. Insulin facilitates the movement of intracellular glucose transporters to the cell membrane.
It is important to note that entry of glucose into muscle cells is achieved primarily via a carrier-mediated system consisting of protein transport molecules which is regulated by insulin
Explanation
Generally, the glucose transporters are a wide group of membrane proteins that facilitate the transport of glucose across the plasma membrane and because glucose is a important source of energy for all life, these transporters are present in all phyla and are mainly regulated by insulin produced from the liver whenever the cell sense presence of glucose through the receptors and other mechanisms
