Active and Passive Transport

Front

What does it mean for a cell membrane to be selectively permeable?

Back

Cell membranes regulate which substances can enter and exit the cell.

Front

What is the process called when substances move from areas of low concentration to areas of high concentration?

Back

Active Transport

Front

What is the movement of water through a semi-permeable membrane called?

Back

Osmosis

Front

Which type of passive transport uses proteins to help molecules pass through the membrane?

Back

Facilitated diffusion

Front

What happens to an animal cell placed in a hypertonic (salty) solution?

Back

It shrinks (gets smaller).

Front

Define passive transport.

Back

The movement of substances across a cell membrane without the use of energy.

Front

Define active transport.

Back

The movement of substances against their concentration gradient, requiring energy.

Front

What is diffusion?

Back

The movement of molecules from an area of higher concentration to an area of lower concentration.

Front

What is osmosis specifically concerned with?

Back

The movement of water molecules.

Front

What role do transport proteins play in facilitated diffusion?

Back

They help larger or polar molecules pass through the cell membrane.