Chapter 3, Problem 4UC

Summary Introduction

To describe:

The methods of membrane transport, and suggest which substances are transported by each method.

Also, write about if the method of transport is active or passive, assisted or unassisted.

Introduction:

Any substance that passes between cells and the enveloping extracellular fluid must possess the tendency to pass through the plasma membrane. If a component can pass through the membrane, the membrane is considered permeable for that component, however, in case if the component cannot pass, then the membrane is considered impermeable to it. The plasma membrane possesses the tendency of selective permeability, that is, it allows some of the particles to go through while inhibiting the others.