active and passive transport

Front

What is active transport?

Back

Active transport is the movement of molecules across a cell membrane from a region of lower concentration to a region of higher concentration, requiring energy (ATP).

Front

What is passive transport?

Back

Passive transport is the movement of molecules across a cell membrane without the use of energy, occurring along the concentration gradient.

Front

What are the three types of passive transport?

Back

The three types of passive transport are diffusion, osmosis, and facilitated diffusion.

Front

What is diffusion?

Back

Diffusion is the process by which molecules spread from an area of high concentration to an area of low concentration until evenly distributed.

Front

What is osmosis?

Back

Osmosis is the diffusion of water molecules through 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 the process of passive transport of molecules across a cell membrane via specific transmembrane integral proteins.

Front

What is endocytosis?

Back

Endocytosis is the process by which cells take in substances by engulfing them in a membrane.

Front

What is exocytosis?

Back

Exocytosis is the process by which cells expel materials in vesicles that fuse with the plasma membrane.

Front

What is the sodium-potassium pump?

Back

The sodium-potassium pump is a type of active transport that moves sodium ions out of the cell and potassium ions into the cell against their concentration gradients.

Front

What is the main difference between active and passive transport?

Back

The main difference is that active transport requires energy to move substances against their concentration gradient, while passive transport does not require energy.