occurs when substances cross the plasma membrane without any input of energy from the cell.

is the movement of a substance across a membrane, due to a difference in concentration, without any help from other molecules.

is a special type of diffusion — the diffusion of water molecules across a membrane.

facilitated diffusion

Diffusion with the help of transport proteins is called

Hydrophilic molecules, charged ions, and relatively large molecules such as glucose all need help with diffusion. The help comes from special proteins in the membrane known as

occurs when energy is needed for a substance to move across a plasma membrane.

sodium-potassium pump.

When this pump is in operation, sodium ions are pumped out of the cell, and potassium ions are pumped into the cell.

Very large molecules cross the plasma membrane with a different sort of help, called

is the type of vesicle transport that moves a substance into the cell.

is the type of vesicle transport that moves a substance out of the cell.

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Chapter 3.3

Term	Definition
Passive transport	occurs when substances cross the plasma membrane without any input of energy from the cell.
diffusion	is the movement of a substance across a membrane, due to a difference in concentration, without any help from other molecules.
osmosis	is a special type of diffusion — the diffusion of water molecules across a membrane.
facilitated diffusion	Diffusion with the help of transport proteins is called
transport proteins	Hydrophilic molecules, charged ions, and relatively large molecules such as glucose all need help with diffusion. The help comes from special proteins in the membrane known as
active transport	occurs when energy is needed for a substance to move across a plasma membrane.
sodium-potassium pump.	When this pump is in operation, sodium ions are pumped out of the cell, and potassium ions are pumped into the cell.
vesicle transport	Very large molecules cross the plasma membrane with a different sort of help, called
Endocytosis	is the type of vesicle transport that moves a substance into the cell.
Exocytosis	is the type of vesicle transport that moves a substance out of the cell.

Created by: JOBBY

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