4.2 Passive Transport

Front

What is passive transport?

Back

Passive transport is the movement of substances across a cell membrane without the use of cellular energy. It relies on the concentration gradient.

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What is diffusion?

Back

Diffusion is the process by which molecules spread from areas of high concentration to areas of low concentration until equilibrium is reached.

Front

What is osmosis?

Back

Osmosis is 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 facilitated diffusion?

Back

Facilitated diffusion is a type of passive transport that uses transport proteins to help move substances across the cell membrane.

Front

What is active transport?

Back

Active transport is the movement of substances against their concentration gradient, requiring energy (ATP) to do so.

Front

What is a hypertonic solution?

Back

A hypertonic solution has a higher concentration of solutes compared to another solution, leading to water moving out of cells placed in this solution.

Front

What is a hypotonic solution?

Back

A hypotonic solution has a lower concentration of solutes compared to another solution, causing water to move into cells placed in this solution.

Front

What is isotonic solution?

Back

An isotonic solution has equal concentrations of solutes compared to another solution, resulting in no net movement of water into or out of cells.

Front

What role do transport proteins play in facilitated diffusion?

Back

Transport proteins assist in the movement of larger or polar molecules across the cell membrane without using energy.

Front

What is the concentration gradient?

Back

The concentration gradient is the difference in the concentration of a substance between two areas, which drives diffusion.