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Requires energy from an outside source to move molecules across membranes
What is passive transport?
Does not require energy to move molecules across membranes
What is selectively permeable?
Whether or not a substance enters a cell depends on the properties of the cell membrane and those of a substance
What is permeable?
If a membrane allows a substance to pass through
What is impermeable?
If a membrane does not allow a substance to pass through
What is concentration difference?
Affects the rate of diffusion, it is the difference of a solute in a solution
What is concentration gradient?
A gradual change in the concentration of solutes in a solution
What is dynamic equilibrium?
A result of diffusion, where the concentration has equalized but molecules continue to move with no overall charge
What is electrical gradients?
The input of energy to transport ions across the membranes
What is electrochemical gradients?
The response from ions moving to combined electrical and concentration gradients
What is Fick’s Law?
A relationship that involves rate of diffusion, surface area, concentration gradient, and membrane permeability
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