Learning Goals/Objectives for Chapter 6A:  After class and this reading, students will be able to

• define flux (J) of solute (A) across a membrane;
• write mathematical relationship that show how flux J depends on the concentration gradient of solute across the membrane (dA/dx) and also on the difference of solute concentration across the membrane (ΔA) for passive diffusion;
• differentiate between passive diffusion, facilitated diffusion mediated by a receptor transporter, and active transport
• write chemical equations which show the physical steps in the process of passive and facilitated diffusion
• derive a mathematical equation and graphs which shows the dependencies of flux J as a function of Aout and AR for facilitated diffusion assuming rapid equilibrium binding of ;
• differentiate between carrier proteins, permeases or transport proteins on one hand and channels on the other;