Cell Membrane & Cell Transport

Front

What is osmosis?

Back

The movement of water molecules from a region of high concentration to a region of low concentration through a selectively permeable membrane.

Front

Define selectively permeable membrane.

Back

A membrane that allows some molecules to cross while preventing others from doing so.

Front

What happens to cells when a person drinks salty water?

Back

The cells shrink due to the loss of water to the surrounding salty environment.

Front

What is endocytosis?

Back

The process by which cells engulf substances from their external environment, bringing them into the cell.

Front

Define active transport.

Back

The movement of particles through the cell membrane from a region of lower concentration to a region of higher concentration using energy in the form of ATP.

Front

What is passive transport?

Back

The movement of molecules across the cell membrane without the use of energy, typically from a region of higher concentration to a region of lower concentration.

Front

What is the role of ATP in active transport?

Back

ATP provides the energy required to move substances against their concentration gradient.

Front

What is diffusion?

Back

The net movement of molecules from an area of higher concentration to an area of lower concentration until equilibrium is reached.

Front

What is the difference between osmosis and diffusion?

Back

Osmosis specifically refers to the movement of water, while diffusion refers to the movement of any type of molecules.

Front

What is exocytosis?

Back

The process by which cells expel materials to the outside environment by vesicles fusing with the cell membrane.