Chapter 5 The Movement of Substances Across Cell Membranes

Content of this chapter

Outline

1. Principles of membrane transport

2. Passive transport and active transport
        A. Comparison of two classes of transport.
      B. Two classes of membrane transport proteins

3. Active transport: Carrier protein-mediated movement up
     the gradient
        A. This process differs from facilitated diffusion in two crucial aspects
        B. Cells carry out active transport in three main ways
        C. Direct active transport depends on four types of transport ATPases

4. Indirect active transport is driven by Ion
     gradients-Cotransport
        A. Sugars, amino acids, and other organic molecules into cells:
        B. Cotransport: Symport and antiport

5. Endocytosis: Large molecules enter into cells
        A. Endocytosis imports extracellular molecules dissolved or suspended
       in fluid by forming vesicles from the plasma membrane
        B. Phagocytosis: The uptake of large particles
        C. Receptor-mediated endocytosis

6. Membrane Potentials and Nerve Impulses