Passive Transport: Simple, Facilitated, and Osmosis

Front

What is passive transport?

Back

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

Front

What are the three types of passive transport?

Back

The three types of passive transport are simple diffusion, facilitated diffusion, and osmosis.

Front

Define simple diffusion.

Back

Simple diffusion is the process by which small, nonpolar molecules move directly through the phospholipid bilayer from an area of higher concentration to an area of lower concentration.

Front

What is facilitated diffusion?

Back

Facilitated diffusion is the process by which larger or polar molecules pass through the cell membrane with the help of transport proteins.

Front

What role do channel proteins play in facilitated diffusion?

Back

Channel proteins provide a passageway for specific molecules to cross the cell membrane, allowing substances to move down their concentration gradient.

Front

Define 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 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 an isotonic solution?

Back

An isotonic solution has an equal concentration of solutes inside and outside the cell, resulting in no net movement of water.

Front

How does the cell membrane maintain homeostasis?

Back

The cell membrane maintains homeostasis by regulating the movement of substances in and out of the cell, ensuring a stable internal environment.