Passive Transport

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 role does the cell membrane play in homeostasis?

Back

The cell membrane controls what substances may enter or leave the cell, helping to maintain a stable internal environment.

Front

Define selectively permeable in the context of cell membranes.

Back

Selectively permeable means that the cell membrane allows certain substances to pass while blocking others.

Front

What happens to a cell in a hypotonic solution?

Back

In a hypotonic solution, water enters the cell, causing it to swell and potentially burst.

Front

What is facilitated diffusion?

Back

Facilitated diffusion is the process of molecules diffusing across a membrane through protein channels, moving from an area of higher concentration to lower concentration.

Front

Explain 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 the difference between simple diffusion and facilitated diffusion?

Back

Simple diffusion occurs directly through the membrane, while facilitated diffusion requires protein channels to help transport molecules.

Front

What is the effect of placing a cell in a hypertonic solution?

Back

In a hypertonic solution, water leaves the cell, causing it to shrink.

Front

What is the concentration gradient?

Back

The concentration gradient is the difference in the concentration of a substance across a space, driving the movement of molecules.

Front

What is active transport?

Back

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