Untitled Flashcard Set

Cell Membrane

Controls what enters and leaves the cell.

Selectively Permeable

Property of the cell membrane that allows some substances to pass while excluding others.

Cell Transport

The movement of substances across the cell membrane.

Concentration Gradient

A difference in the concentration of a substance between two areas.

Passive Transport

Movement of substances from high concentration to low concentration that does not require energy (ATP).

Diffusion

Movement of particles from high concentration to low concentration until equilibrium is reached.

Equilibrium

State where particles are evenly distributed.

Osmosis

The diffusion of water across a selectively permeable membrane.

Facilitated Diffusion

Movement of substances from high concentration to low concentration using transport proteins, without requiring ATP.

Hypotonic Solution

Solution with more water outside the cell, causing water to move into the cell and potentially swell or burst it.

Hypertonic Solution

Solution with less water outside the cell, causing water to move out and resulting in cell shrinkage.

Isotonic Solution

Solution where concentrations are equal, allowing water to move in and out at equal rates, maintaining cell size.

Active Transport

Movement of substances from low concentration to high concentration that requires energy (ATP).

Endocytosis

Process of moving large materials into the cell, requiring energy.

Exocytosis

Process of moving large materials out of the cell, requiring energy.