CAROL & MIKE WERNER / SCIENCE PHOTO LIBRARY CAROL & MIKE WERNER / SCIENCE PHOTO LIBRARY
On the right, insulin binds with its receptor in a normal manner. This brings the glucose transporter (Glut-4) to the plasma membrane, allowing glucose to enter the cell. On the left, insulin fails to bind and the Glut-4 is not activated and glucose is prevented from entering the cell. The glucose molecules return to the blood stream, thus elevating the blood-sugar level.
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