Cell membranes contain channels and pores that allow transport of molecules according to saturation kinetics. The Na+-K+ ATPase actively transports sodium and potassium ions across the membrane using ATP as an energy source. This primary active transport establishes electrochemical gradients that allow for secondary active transport of molecules like glucose.

2. Cell Membranes

4. Channels
and Pores

5. Saturation Kinetics of transport

7. Na+-K+
ATPase

8. 1o active transport of Na+
2o active transport of
glucose