Biology Reference
In-Depth Information
CHAPTER
14
M
embrane Transpo
rt
OUTLINE
A. Introduction
305
Bacterial Lactose Transport
322
Fick's First Law
307
Vectorial Metabolism
323
Osmosis
307
E. Ionophores
324
B. Simple Passive Diffusion
309
Valinomycin
325
2,4-Dinitrophenol (DNP)
326
C. Facilitated Diffusion
311
Crown Ethers
326
Glucose Transporter
311
Nystatin
327
Potassium Channels
312
Sodium Channel
313
F. Gap Junctions
328
Tetrodotoxin
314
G. Other Ways to Cross the Membrane 329
Receptor Mediated Endocytosis
Saxitoxin
314
329
Solute Equilibrium
315
Pinocytosis and Phagocytosis
330
Aquaporins
316
Pinocytosis
331
D. Active Transport
317
Phagocytosis
332
Primary Active Transport
319
Summary
334
Na
þ
/K
þ
ATPase
319
Mechanism of the Na
þ
/K
þ
ATPase
References
335
321
Secondary Active Transport
321
A. INTRODUCTION
Life depends on a membrane's ability to precisely control the level of solutes in the
aqueous compartments bathing the membrane. The membrane determines what solutes
enter and leave a cell. Trans-membrane transport is controlled by complex interactions
between membrane lipids, proteins, and carbohydrates. How the membrane accomplishes
these tasks is the topic of Chapter 14.
