16.3 - Passive Transport Flashcard (2024)

Front

What is facilitated diffusion?

Back

Facilitated diffusion is the process of moving particles across a cell membrane through protein channels, following the concentration gradient, without the use of energy.

Front

What is the role of the cell membrane?

Back

The cell membrane regulates what enters and leaves a cell, maintaining homeostasis and protecting the internal environment.

Front

What is diffusion?

Back

Diffusion is the movement of particles from an area of higher concentration to an area of lower concentration until equilibrium is reached.

Front

What is osmosis?

Back

Osmosis is the diffusion of water molecules across a selectively permeable membrane from an area of lower solute concentration to an area of higher solute concentration.

Front

What is active transport?

Back

Active transport is the movement of particles against their concentration gradient, requiring energy (ATP) to move substances into or out of a cell.

Front

What is the difference between diffusion and facilitated diffusion?

Back

Diffusion occurs directly through the membrane, while facilitated diffusion requires specific protein channels to help transport substances.

Front

What are protein pumps?

Back

Protein pumps are integral membrane proteins that use energy to transport ions or molecules across the cell membrane against their concentration gradient.

Front

What is the significance of concentration gradients in passive transport?

Back

Concentration gradients drive passive transport, allowing substances to move from areas of high concentration to areas of low concentration without energy.

Front

What is an example of a substance that uses facilitated diffusion?

Back

Glucose is an example of a substance that uses facilitated diffusion to enter cells through specific transport proteins.

Front

What is the difference between endocytosis and exocytosis?

Back

Endocytosis is the process of taking substances into the cell by engulfing them, while exocytosis is the process of expelling substances from the cell.