Chapter 8 Biology- Braunberger

Front

What is diffusion?

Back

Diffusion is the passive transport process where molecules move randomly from an area of high concentration to an area of low concentration until equilibrium is reached.

Front

What is facilitated diffusion?

Back

Facilitated diffusion is a type of passive transport that uses protein channels to help move molecules across the cell membrane without using energy.

Front

What is osmosis?

Back

Osmosis is the diffusion of water molecules through a selectively permeable membrane from an area of low solute concentration to an area of high solute concentration.

Front

What is a hypertonic solution?

Back

A hypertonic solution has a higher concentration of solutes outside the cell than inside, causing water to move out of the cell and the cell to shrink.

Front

What is a hypotonic solution?

Back

A hypotonic solution has a lower concentration of solutes outside the cell than inside, causing water to move into the cell and the cell to swell.

Front

What is an isotonic solution?

Back

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

Front

What happens to a cell in a hypertonic solution?

Back

The cell shrinks as water moves out of the cell to balance the solute concentration.

Front

What happens to a cell in a hypotonic solution?

Back

The cell swells and may burst as water moves into the cell to balance the solute concentration.

Front

What is active transport?

Back

Active transport is the movement of molecules across a cell membrane from a region of lower concentration to a region of higher concentration, requiring energy.

Front

What is endocytosis?

Back

Endocytosis is an active transport process where the cell engulfs material from the outside environment, bringing it into the cell.