Passive and Active Transport

Front

What is passive transport?

Back

The movement of substances across a cell membrane without the use of energy, typically along a concentration gradient.

Front

What is active transport?

Back

The movement of substances against a concentration gradient, requiring energy, often in the form of ATP.

Front

Define diffusion.

Back

The process by which molecules spread from an area of high concentration to an area of low concentration.

Front

What is osmosis?

Back

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 a concentration gradient?

Back

A difference in the concentration of a substance across a space.

Front

What is facilitated diffusion?

Back

A type of passive transport that uses transport proteins to help move substances across a cell membrane.

Front

What is endocytosis?

Back

A form of active transport where cells engulf substances into a pouch that becomes a vesicle.

Front

What is exocytosis?

Back

A process by which a cell expels materials in vesicles that fuse with the cell membrane.

Front

What is an isotonic solution?

Back

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

Front

What is a hypertonic solution?

Back

A solution with a higher concentration of solutes compared to the inside of the cell, causing water to leave the cell.