Human Physiology: An Integrated Approach (8th Edition)
8th Edition
ISBN: 9780134605197
Author: Dee Unglaub Silverthorn
Publisher: PEARSON
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Chapter 5.3, Problem 11CC
If the distance over which a molecule must diffuse triples from 1 to 3, diffusion takes how many times as long?
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Students have asked these similar questions
Which of the following is inversely related to the rate of diffusion for certain substance:
a- Diffusion coefficient
b- Area available for diffusion
C- Width of cell membrane
d- Different in concentration for the substance
Two dyes were placed on a medium that allowed for diffusion. The molecular weight of dye A is 793 g/mol and the molecular weight of dye B is 496 g/mol, which one of these dyes would diffuse faster? Explain.
If we were to measure diffusion rate over time, do you think it would change or stay consistent?
If you think diffusion rate changes over time, why does it slow down or stop completely?
Where in the human body does diffusion occur? Give three examples.
Chapter 5 Solutions
Human Physiology: An Integrated Approach (8th Edition)
Ch. 5.1 - If the 58-kg Reference Woman has total body water...Ch. 5.1 - A mother brings her baby to the emergency room...Ch. 5.1 - Prob. 6CCCh. 5.1 - Two compartments are separated by a membrane that...Ch. 5.1 - Prob. 8CCCh. 5.1 - Prob. 9CCCh. 5.1 - Prob. 10CCCh. 5.3 - If the distance over which a molecule must diffuse...Ch. 5.3 - Prob. 12CCCh. 5.3 - Which is more likely to cross a cell membrane by...
Ch. 5.3 - Prob. 14CCCh. 5.3 - Prob. 15CCCh. 5.3 - Prob. 16CCCh. 5.4 - Positively charged ions are called _____, and...Ch. 5.4 - Name four functions of membrane proteins.Ch. 5.4 - Prob. 19CCCh. 5.4 - Prob. 20CCCh. 5.4 - If a channel is lined with amino acids that have a...Ch. 5.4 - Prob. 22CCCh. 5.4 - Liver cells (hepatocytes) are able to convert...Ch. 5.4 - Prob. 24CCCh. 5.5 - What would you call a carrier that moves two...Ch. 5.5 - Prob. 26CCCh. 5.5 - Prob. 27CCCh. 5.5 - Name the two membrane protein families associated...Ch. 5.5 - Prob. 29CCCh. 5.6 - Prob. 30CCCh. 5.6 - Prob. 31CCCh. 5.6 - Prob. 32CCCh. 5.6 - Prob. 33CCCh. 5.7 - Prob. 34CCCh. 5 - Using what you learned about the naming...Ch. 5 - Prob. 2CCCh. 5 - Prob. 3CCCh. 5 - Prob. 1RQCh. 5 - Distinguish between active transport and passive...Ch. 5 - Which of the following processes are examples of...Ch. 5 - List four factors that increase the rate of...Ch. 5 - List the three physical methods by which materials...Ch. 5 - A cotransporter is a protein that moves more than...Ch. 5 - Prob. 7RQCh. 5 - Prob. 8RQCh. 5 - Prob. 9RQCh. 5 - What determines the osmolarity of a solution? In...Ch. 5 - Prob. 11RQCh. 5 - Prob. 12RQCh. 5 - Prob. 13RQCh. 5 - Prob. 14RQCh. 5 - The membrane potential at which the electrical...Ch. 5 - Prob. 16RQCh. 5 - Create a map of transport across cell membranes...Ch. 5 - Draw a large rectangle to represent the total body...Ch. 5 - What factors influence the rate of diffusion...Ch. 5 - Define the following terms and explain how they...Ch. 5 - Prob. 21RQCh. 5 - Prob. 22RQCh. 5 - Prob. 23RQCh. 5 - Prob. 24RQCh. 5 - Prob. 25RQCh. 5 - Prob. 26RQCh. 5 - The following terms have been applied to membrane...Ch. 5 - Prob. 28RQCh. 5 - NaCl is a nonpenetrating solute and urea is a...Ch. 5 - Prob. 30RQCh. 5 - Prob. 31RQCh. 5 - What is the osmolarity of half-normal saline (=...Ch. 5 - Prob. 33RQCh. 5 - Prob. 34RQ
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- The principal force driving movement in diffusion is______. a. temperature b. particle size c. concentration gradient d. membrane surface areaarrow_forwardVisit 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_forwardWhy is simple diffusion not an option for most molecules?arrow_forward
- Suppose you are determining the diffusion coefficient of the following molecule in a homogeneous liquid like water. List molecules in the order of higher diffusion coefficients assuming they are in the same solution. Provide justification. molecules: H2, vitamin C, 20-bp single stranded DNA, glucose oxidase proteinarrow_forwardWhich of the following does not characterize the different factors that affects the rate of diffusion? Mass of molecules diffusing Solute density Temperature Extent of concentration gradientarrow_forwardDiscuss why the following affect the rate of diffusion:molecular size, temperature, solution density, and thedistance that must be traveled.arrow_forward
- C) The instantaneous velocity of a molecule tells you little about the time it takes a molecule to move cellular distances because the molecule's trajectory is constantly altered by collisions with other molecules in solution. The average time that it takes for a molecule to travel “x" cm by diffusion in three dimensions is given by t=x/6D, where t is time in seconds, and D is the diffusion coefficient, which is a constant that depends on the size and shape of a molecule. Glucose and myoglobin have diffusion coefficients of 5 X 10°cm?/sec and 5 X 10° cm?/sec, respectively. Calculate the average time that it would take for a molecule of glucose and a molecule of myoglobin to diffuse a distance of 25 um, an approximate width for a mammalian cell.arrow_forwardWhich of the following affects the permeability constant of a molecule in diffusion? the molecular weight of the diffusing molecule the characteristics of the membrane through which the molecule must diffuse the temperature of the system the size of the molecule all of the abovearrow_forwardIn figure 4-7 why does facilitated diffusion have a maximum rate of diffusion? arrow_forward
- The experiment described in Figure 11-16 was performed at 37 °C. If the experiment were carried out at 10 °C, what effect would you expect on the rate of diffusion? Why?arrow_forwardWhich of the following statements about diffusion is correct? It is an active process in which molecules move from a region of lower concentration to one of higher concentration. It is very rapid over long distances. It requires an expenditure of energy by the cell. It is a passive process in which molecules move from a region of lower concentration to a region of higher concentration. It is a passive process in which molecules move from a region of higher concentration to a region of lower concentration.arrow_forwardClassify each example as requiring either diffusion or bulk flow as a mechanism for molecular transport. Diffusion Bulk Flowarrow_forward
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