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 is the role of the cell membrane in passive transport?

Back

The cell membrane controls what substances may enter or leave the cell, helping maintain homeostasis.

Front

Define selectively permeable membrane.

Back

A selectively permeable membrane allows certain substances to pass through while blocking others.

Front

What is facilitated diffusion?

Back

Facilitated diffusion is a type of passive transport that uses protein channels to help molecules move across the cell membrane along their concentration gradient.

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

How do molecules move during diffusion?

Back

Molecules move from an area of higher concentration to an area of lower concentration until equilibrium is reached.

Front

What happens to a cell in a hypertonic solution?

Back

In a hypertonic solution, water moves out of the cell, causing it to shrink.

Front

What happens to a cell in a hypotonic solution?

Back

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

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.

Front

What is the concentration gradient?

Back

The concentration gradient is the difference in the concentration of a substance across a space.