Front

What is diffusion?

Back

The passive movement of substances from an area of high concentration to an area of low concentration.

Front

What direction does the concentration gradient move in passive transport?

Back

From high concentration to low concentration.

Front

What is endocytosis?

Back

The process by which cells engulf substances from their external environment.

Front

What is the primary function of the cell membrane?

Back

To act as a protective outer layer that controls what enters and leaves the cell.

Front

What is exocytosis?

Back

The process by which cells expel materials to the outside environment.

Front

What is facilitated diffusion?

Back

A type of passive transport that uses protein channels to help move substances across the cell membrane.

Front

What is active transport?

Back

The movement of substances against their concentration gradient, requiring energy.

Front

What role do white blood cells play in endocytosis?

Back

They engulf bacteria and other foreign particles to protect the body.

Front

What is a concentration gradient?

Back

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

Front

What is osmosis?

Back

The diffusion of water across a selectively permeable membrane.