Concept explainers
To determine: The factor that contributes more to the increase in the rate of diffusion between increase in area and increase in pressure difference.
Introduction: Simple diffusion occurs spontaneously without the aid of any proteins or carriers while facilitated diffusion requires protein carriers to take place. Diffusion takes place along the concentration gradient and does not require any energy for movement.
Explanation of Solution
The rate of diffusion is affected by several factors like increase in surface area, temperature, viscosity, thickness, distance, and so on. The diffusion increases with the increase in the surface area of the membrane and decreases when the diffusing area is too small. The pressure difference is the major driving force for the movement of the particles from the area of high pressure to the area of low pressure. so, if the pressure difference between the two areas is large then the rate of the diffusion is rapidly increased than the increase in the rate when the area is large. The molecules can also rush through the site of smaller area if the difference in the pressure is large enough to increase the rate of diffusion.
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Chapter 47 Solutions
BIOLOGY (LOOSELEAF)-W/CONNECT
- 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_forwardBriefly explain what it means for a membrane to be selectively permeable. What kinds of molecules can pass freely? What needs help getting through? Is energy always required and when is it needed?arrow_forwardAn increase in which of the following would decrease rate of diffusion(flux)? (there can be multiple answers) -temperature -membrane thickness -concentration gradient -membrane permeability -membrane area -molecular sizearrow_forward
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- Which of the following scenarios is an example of diffusion? A. A glass of water is spilled, and the water flows all over the place B. Sodium and chloride ions from salt dissipate through a glass of water, passing through a membrane in the process C. Water flows through a membrane based on the amount of solute on either side of the membrane D. A cloud of hairspray dissipates throughout a room E. All of the answer choices are correctarrow_forwardWhich of the following are features of facilitated diffusion? There may be more than one correct answer, select all that apply. Requires energy Movement assisted by proteins Can include passive diffusion Depends on ATP hydrolysis Can include ion transport down its concentration gradient in a cell (high to low concentration)arrow_forwardFacilitated transport differs from diffusion in that facilitated diffusiona. involves the passive use of a carrier protein.b. involves the active use of a carrier protein.c. moves a molecule from a low to a high concentration.d. involves the use of ATP molecules.arrow_forward
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