Principles of Human Physiology Plus Mastering A&P with Pearson eText - Access Card Package (6th Edition)
6th Edition
ISBN: 9780134169040
Author: Cindy L. Stanfield
Publisher: PEARSON
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Chapter 4.3, Problem 4.3.1QC
In simple diffusion, do individual molecules always go down their concentration gradient? Why or why not?
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In what direction is there a net movement of particles along their concentration gradient? Would your answers be different for facilitated diffusion compared with simple diffusion?
Without saturation of transport proteins and under the same concentration gradient how can the speed of simple diffusion be compared to the speed of facilitated diffusion?
In figure 4-7 why does facilitated diffusion have a maximum rate of diffusion?

Chapter 4 Solutions
Principles of Human Physiology Plus Mastering A&P with Pearson eText - Access Card Package (6th Edition)
Ch. 4.1 - What is the difference between passive transport...Ch. 4.1 - Prob. 4.1.2QCCh. 4.1 - Prob. 4.1.3QCCh. 4.1 - Determine the direction of the electrical driving...Ch. 4.1 - Assume that sodium and calcium ions are being...Ch. 4.1 - Refer to Table 4.1 for intracellular and...Ch. 4.3 - In simple diffusion, do individual molecules...Ch. 4.3 - Prob. 4.3.2QCCh. 4.3 - Prob. 4.3.3QCCh. 4.3 - What is the difference between a channel and a...
Ch. 4.3 - Prob. 4.4.2QCCh. 4.3 - Prob. 4.4.3QCCh. 4.4 - Prob. 4.5.1QCCh. 4.4 - Prob. 4.5.2QCCh. 4.4 - Prob. 4.5.3QCCh. 4.6 - Name the three types of endocytosis. Which type(s)...Ch. 4.6 - Prob. 4.6.2QCCh. 4.7 - Prob. 4.7.1QCCh. 4.7 - Prob. 4.7.2QCCh. 4.7 - Prob. 1CTQCh. 4.7 - Prob. 2CTQCh. 4.7 - Prob. 3CTQCh. 4 - Prob. 1ECh. 4 - Prob. 2ECh. 4 - Prob. 3ECh. 4 - Prob. 4ECh. 4 - Prob. 5ECh. 4 - Prob. 6ECh. 4 - Prob. 7ECh. 4 - Movement of Na+ in sodium-linked glucose...Ch. 4 - Prob. 9ECh. 4 - Prob. 10ECh. 4 - Which of the following transport mechanisms...Ch. 4 - Substances that cross cell membranes by simple...Ch. 4 - Prob. 13ECh. 4 - Prob. 14ECh. 4 - Prob. 15ECh. 4 - Prob. 16ECh. 4 - Prob. 17ECh. 4 - Prob. 18ECh. 4 - Describe the various factors that determine...Ch. 4 - Explain the mechanism of glucose absorption by...Ch. 4 - Prob. 21ECh. 4 - Prob. 22ECh. 4 - Prob. 23ECh. 4 - Prob. 24ECh. 4 - Prob. 25ECh. 4 - Prob. 26ECh. 4 - Prob. 27E
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- Visit this link (http://openstaxcollege.org/l/diffusion) to see diffusion and how it is propelled by the kinetic energy of molecules in solution. How does temperature affect diffusion rate, and why?arrow_forwardThe principal force driving movement in diffusion is______. a. temperature b. particle size c. concentration gradient d. membrane surface areaarrow_forwardWhich of the following methods of transport is being used to transfer the substance into the cell in the accompanying graph? a. diffusion down a concentration gradient b. osmosis c. facilitated diffusion d. active transport e. vesicular transport f. It is impossible to tell with the information provided.arrow_forward
- Discuss why the following affect the rate of diffusion: molecular size, temperature, solution density, and the distance that must be traveledarrow_forwardWhat two properties must a substance typically have to be capable of simple diffusion across a cell membrane? If a substance does not have these properties, can it still cross a cell membrane? How?arrow_forwardhow are simple diffusion and facilitated diffusion similar? how are they different? how are facilitated diffusion and active transport similar? how are they different?arrow_forward
- What do facilitated diffusion and active transport have in common? What are the differences between them?arrow_forwardWhat do diffusion and osmosis have in common? How are they different from active transport? In the nervous system, where can you find examples of each of these?arrow_forwardHow does facilitated diffusion differ from simple diffusion?arrow_forward
- What advantages are there to using diffusion as a transport mechanism versus active transport of a substance?arrow_forwardDiffusion has maximal transport rate? True or False?arrow_forwardTwo students are discussing the effect of concentration gradient on diffusion. Student A says, “The higher the concentration gradient, the slower the rate of diffusion.“ But student B thinks the opposite. Who is correct?arrow_forward
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