Cell Membrane and Cell Transport

Front

What is the function of the cell membrane?

Back

The cell membrane regulates what enters and leaves the cell, helping to maintain homeostasis.

Front

Define 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 happens to a cell in a hypotonic solution?

Back

In a hypotonic solution, water moves into the cell, causing it to swell and possibly burst.

Front

What does selectively permeable mean?

Back

Selectively permeable means that some molecules can cross the membrane while others cannot.

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 is osmosis?

Back

Osmosis is the movement of water across a selectively permeable membrane from an area of lower solute concentration to an area of higher solute concentration.

Front

What is diffusion?

Back

Diffusion is the movement of molecules from an area of higher concentration to an area of lower concentration.

Front

What role do transport proteins play in the cell membrane?

Back

Transport proteins help move substances across the cell membrane that cannot pass through the lipid bilayer directly.

Front

What is active transport?

Back

Active transport is the movement of molecules against their concentration gradient, requiring energy (ATP).

Front

What is passive transport?

Back

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