10 Questions
Which statement about the movement of solutes through a membrane is true?
The rate of facilitated diffusion of a solute is limited by the number of transporters in the membrane at any given time.
In terms of osmolality and tonicity, what effect does an impermeable solute in the ECF have on a cell?
Causes the cell to shrink due to water loss.
What happens when a cell is placed in a solution that is hyperosmotic but not hypertonic?
Water flows into the cell.
Which process is responsible for the movement of both an ion and an organic molecule across a membrane?
Cotransport
If the concentration of a substance increases in the ECF compartment and the cell membrane is impermeable to this substance, what term describes the ECF?
Hypertonic
When considering diffusion rates, which statement is correct?
Lipid-soluble solutes diffuse more readily through a plasma membrane than water-soluble ones.
What effect does an isotonic solution have on intracellular volume?
Leads to no net movement of water across the cell membrane.
Which property makes facilitated diffusion different from simple diffusion?
Involves the use of transport proteins or carriers.
What happens to a cell in a hypotonic solution compared to its original state?
The cell swells due to water intake.
If a solution causes no change in intracellular volume, what term describes that solution?
Isotonic
Test your knowledge on simple diffusion, a passive process where particles flow down a concentration gradient without the use of energy. Explore how diffusion rate is affected by concentration gradient, electrical gradient, and membrane permeability. Learn about the factors that influence the ease of diffusion for lipid-soluble particles.
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