Cell Membrane and 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

Why is passive transport called 'passive'?

Back

It is called 'passive' because it occurs without using energy.

Front

What are the main components of the cell membrane?

Back

The cell membrane is primarily made of phospholipids, proteins, cholesterol, and carbohydrates.

Front

What is an isotonic solution?

Back

An isotonic solution has the same concentration of solutes as the inside of the cell, resulting in no net movement of water.

Front

What is a hypertonic solution?

Back

A hypertonic solution has a higher concentration of solutes compared to the inside of the cell, causing water to move out of the cell.

Front

What is a hypotonic solution?

Back

A hypotonic solution has a lower concentration of solutes compared to the inside of the cell, causing water to move into the cell.

Front

What is osmosis?

Back

Osmosis is the passive transport of water molecules across 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 protein channels to help move substances across the cell membrane from high to low concentration.

Front

What is simple diffusion?

Back

Simple diffusion is the movement of small or nonpolar molecules directly through the lipid bilayer of the cell membrane from an area of high concentration to low concentration.

Front

What role do proteins play in passive transport?

Back

Proteins can act as channels or carriers to facilitate the movement of specific molecules across the cell membrane.