Co-transport

Question 1

Definition

Answer 1

The coupled movement of one molecule with its concentration and another molecule against its concentration gradient

Question 2

What do co-transporters do?

Answer 2

They bind 2 molecules at a time. The concentration of 1 of the molecules is used to move the other molecule against its own concentration gradient

Question 3

Step of co-transport (using sodium and glucose)

Answer 3

Sodium is actively transported out of the lumen using the sodium-potassium pump. Which changes the concentration gradient
Sodium diffuses, down its concentration gradient, via the co-transporter protein
Therefore the co-transporter also carries glucose
Glucose passes into the blood, by facilitated diffusion and a carrier protein