Facilitated diffusion is a. the random movement of a...

Facilitated diffusion is a. the random movement of a substance from a region of higher concentration to a region of lower concentration. b. the movement of water across the plasma membrane. c. the movement of molecules across the plasma membrane against a concentration gradient with the aid of a carrier protein and energy supplied by the cell. d. the movement of a substance from a region of higher concentration to a region of lower concentration with the aid of a membrane protein.

Facilitated diffusion is
a. the random movement of a substance from a region of higher concentration to a region of lower concentration.
b. the movement of water across the plasma membrane.
c. the movement of molecules across the plasma membrane against a concentration gradient with the aid of a carrier protein and energy supplied by the cell.
d. the movement of a substance from a region of higher concentration to a region of lower concentration with the aid of a membrane protein.

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Key Concepts

Facilitated Diffusion

Facilitated diffusion is a type of passive transport that allows substances to cross cell membranes with the help of specific transmembrane proteins, such as channels or carriers. Unlike simple diffusion, it occurs when the molecules are too large or polar to pass directly through the lipid bilayer, yet it does not require the use of energy from the cell.

Passive Transport

Passive transport is a mechanism for moving substances across cell membranes without the input of cellular energy. It relies on the inherent kinetic energy of the molecules and moves them down their concentration gradient from areas of high concentration to low concentration.

Membrane Proteins

Membrane proteins, including channel and carrier proteins, facilitate the transport of molecules that cannot easily diffuse through the cell membrane on their own. These proteins provide a pathway that allows specific molecules to move across the membrane while maintaining cellular regulation and function.

Concentration Gradient

A concentration gradient refers to the difference in the concentration of a substance across a space or membrane. In the context of diffusion, molecules naturally move from areas of higher concentration to areas of lower concentration, making it a key driving force behind passive transport processes like facilitated diffusion.

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