16.3 - Passive Transport Flashcard (2024)

Front

What is passive transport?

Back

Passive transport is the movement of substances across a cell membrane without the use of energy, relying on concentration gradients.

Front

What is diffusion?

Back

Diffusion is the process by which molecules spread from an area of high concentration to an area of low concentration.

Front

What is facilitated diffusion?

Back

Facilitated diffusion is the process of passive transport of molecules across a cell membrane via specific transmembrane integral proteins.

Front

What role does the cell membrane play in transport?

Back

The cell membrane regulates what enters and leaves the cell, maintaining homeostasis.

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 the concentration gradient?

Back

The concentration gradient is the difference in the concentration of a substance between two areas.

Front

What is the difference between passive and active transport?

Back

Passive transport does not require energy, while active transport requires energy to move substances against their concentration gradient.

Front

What is an example of a substance that moves via diffusion?

Back

Oxygen and carbon dioxide move across cell membranes via diffusion.

Front

What are protein channels?

Back

Protein channels are integral membrane proteins that allow specific molecules to pass through the cell membrane during facilitated diffusion.

Front

What is the significance of the cell membrane's selective permeability?

Back

Selective permeability allows the cell to maintain homeostasis by controlling the internal environment and regulating the entry and exit of substances.