Passive Transport

Front

What is passive transport?

Back

Passive transport is the movement of molecules across a cell membrane without the use of energy, moving down the concentration gradient.

Front

What do diffusion, osmosis, and facilitated diffusion have in common?

Back

They all move molecules DOWN the concentration gradient.

Front

What is osmosis?

Back

Osmosis is the diffusion of water molecules across a selectively permeable membrane.

Front

What does hypertonic mean?

Back

A hypertonic solution has a higher concentration of solutes compared to another solution.

Front

What does hypotonic mean?

Back

A hypotonic solution has a lower concentration of solutes compared to another solution.

Front

What does isotonic mean?

Back

An isotonic solution has the same concentration of solutes as another solution.

Front

What regulates what molecules enter and leave the cell?

Back

The cell membrane regulates what molecules enter and leave the cell.

Front

What is facilitated diffusion?

Back

Facilitated diffusion is the process of transporting molecules across a membrane via protein channels without energy.

Front

What type of molecules typically require facilitated diffusion?

Back

Molecules that are too big to diffuse directly across the membrane typically require facilitated diffusion.

Front

What happens to a cell in a hypertonic solution?

Back

A cell in a hypertonic solution will lose water and may shrivel.