Passive and Active Transport

Front

What is passive transport?

Back

Passive transport is the movement of molecules across a cell membrane without the use of energy, moving from an area of high concentration to an area of low concentration.

Front

What is active transport?

Back

Active transport is the movement of molecules across a cell membrane using energy, moving from an area of low concentration to an area of high concentration.

Front

Define isotonic solution.

Back

An isotonic solution is a solution where the concentration of solutes is equal inside and outside the cell, resulting in no net movement of water.

Front

Define hypertonic solution.

Back

A hypertonic solution has a higher concentration of solutes outside the cell than inside, causing the cell to lose water and shrink.

Front

Define hypotonic solution.

Back

A hypotonic solution has a lower concentration of solutes outside the cell than inside, causing the cell to gain water and swell.

Front

What is osmosis?

Back

Osmosis is the diffusion of water molecules across a selectively permeable membrane from an area of low solute concentration to an area of high solute concentration.

Front

What is facilitated diffusion?

Back

Facilitated diffusion is a type of passive transport that uses protein channels to help move molecules across the cell membrane.

Front

What is exocytosis?

Back

Exocytosis is the process by which a cell expels materials in vesicles that fuse with the cell membrane, releasing their contents outside the cell.

Front

What is endocytosis?

Back

Endocytosis is the process by which a cell takes in materials by engulfing them in a vesicle formed from the cell membrane.

Front

What role do protein pumps play in active transport?

Back

Protein pumps are integral membrane proteins that use energy to transport ions or molecules against their concentration gradient.