Cell Transport

Front

What is facilitated diffusion?

Back

Facilitated diffusion is a type of passive transport that uses protein channels to help move substances across the cell membrane from an area of higher concentration to an area of lower concentration without using energy.

Front

What is passive transport?

Back

Passive transport is the movement of substances across a cell membrane without the use of energy, relying on concentration gradients.

Front

What is active transport?

Back

Active transport is the movement of substances against their concentration gradient, from an area of lower concentration to an area of higher concentration, requiring energy (ATP).

Front

What is osmosis?

Back

Osmosis is the passive transport of water molecules through a selectively permeable membrane from an area of lower solute concentration to an area of higher solute concentration.

Front

What is diffusion?

Back

Diffusion is the passive movement of particles from an area of higher concentration to an area of lower concentration until equilibrium is reached.

Front

What is endocytosis?

Back

Endocytosis is an active transport process where cells engulf substances by wrapping them in a portion of the cell membrane, forming a vesicle.

Front

What is exocytosis?

Back

Exocytosis is an active transport process where cells expel materials by vesicles fusing with the cell membrane and releasing their contents outside the cell.

Front

What is the difference between active and passive transport?

Back

Active transport requires energy to move substances against their concentration gradient, while passive transport does not require energy and moves substances along their concentration gradient.

Front

What role do protein channels play in facilitated diffusion?

Back

Protein channels provide a pathway for specific molecules to pass through the cell membrane during facilitated diffusion, allowing substances that cannot directly cross the lipid bilayer to enter or exit the cell.

Front

What is a concentration gradient?

Back

A concentration gradient is the difference in the concentration of a substance between two areas, which drives the movement of particles during diffusion and osmosis.