Front

What is a selectively permeable membrane?

Back

A membrane that allows some substances to pass through while blocking others.

Front

What role does the cell membrane play in cell transport?

Back

The cell membrane allows certain substances, such as water, to enter and leave the cell.

Front

What is exocytosis?

Back

A process where a vesicle fuses with the cell membrane to release waste or substances out of the cell.

Front

Define active transport.

Back

The movement of particles from an area of lower concentration to an area of higher concentration, requiring energy.

Front

Why is energy needed for active transport?

Back

Energy is needed because ions are moved against the concentration gradient.

Front

What is passive transport?

Back

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

Front

What is osmosis?

Back

The diffusion of water across a selectively permeable membrane.

Front

What is the concentration gradient?

Back

The difference in concentration of a substance between two areas.

Front

What is facilitated diffusion?

Back

A process where molecules pass through the cell membrane via special proteins, without energy.

Front

What is a vesicle?

Back

A small membrane-bound sac that transports substances within a cell.