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What are the two transport processes?
1. Passive Transport
2. Active Transport
What are the types of passive transport?
Diffusion and osmosis
What is diffusion?
A passive process in which there is a net or greater movement of molecules or ions from a region of high concentration to a region of low concentration until equilibrium is reached.
What is a solute? What is a solvent?
Which undergoes diffusion?
Solute: the dissolved substance
Solvent: the liquid that does the dissolving
Both undergo diffusion.
How would having a fever affect body processes that involve diffusion?
Because fever involves an increase in body temperature, the rates of all diffusion processes would increase.
Five factors that influence the diffusion rate of substances across plasma membranes:
1. Steepness of the concentration gradient
2. Temperature
3. Mass of the diffusing substance
4. Surface area
5. Diffusion distance
How does rate of diffusion change with steepness of the concentration gradient?
The greater the difference in concentration between the two sides of the membrane, the higher is the rate of diffusion.
How does rate of diffusion change with temperature?
The higher the temperature, the faster the rate of diffusion.
How does rate of diffusion change with the mass of the diffusing particle?
The larger the mass of the diffusing particle, the slower its diffusion rate.
How does rate of diffusion change with the surface area?
The larger the membrane surface area available for diffusion, the faster is the diffusion rate.
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