How does GLUT1 utilize glucose concentration gradients for glucose uptake in erythrocytes?

• A. GLUT1 does not rely on concentration gradients for glucose transport.
• B. GLUT1 transports glucose from areas of low concentration in the blood to high concentration inside the cell.
• C. GLUT1 transports glucose against its concentration gradient using ATP.
• D. GLUT1 transports glucose from areas of high concentration in the blood to low concentration inside the cell.

Answer: (D)