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, moving from an area of higher concentration to an area of lower concentration.

Front

What is osmosis?

Back

Osmosis is the diffusion of water molecules through a semipermeable membrane from an area of low solute concentration to an area of high solute concentration.

Front

What is diffusion?

Back

Diffusion is the net movement of molecules from an area of high concentration to an area of low concentration until equilibrium is reached.

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 endocytosis?

Back

Endocytosis is the process by which a cell engulfs material from its environment, forming a vesicle to bring the material into the cell.

Front

What is exocytosis?

Back

Exocytosis is the process by which a cell expels materials in vesicles, releasing them into the extracellular space.

Front

What role do vesicles play in transport?

Back

Vesicles are small membrane-bound sacs that transport materials within the cell and in and out of the cell during endocytosis and exocytosis.

Front

What is the sodium-potassium pump?

Back

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

Front

What is a semipermeable membrane?

Back

A semipermeable membrane is a barrier that allows certain molecules to pass through while blocking others, such as the cell membrane.