Cell Transport and Osmosis

Front

What is endocytosis?

Back

Endocytosis is the process by which cells take in substances by engulfing them in a membrane.

Front

What is exocytosis?

Back

Exocytosis is the process by which cells expel substances by vesicles fusing with the cell membrane.

Front

Define 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 (ATP).

Front

What is passive transport?

Back

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

Front

What is simple diffusion?

Back

Simple diffusion is the process by which small, nonpolar molecules move directly through the phospholipid bilayer of a cell membrane.

Front

What is facilitated diffusion?

Back

Facilitated diffusion is the process by which larger or polar molecules pass through a cell membrane via protein channels without energy.

Front

Define osmosis.

Back

Osmosis is the diffusion of water across a semipermeable membrane from an area of lower solute concentration to an area of higher solute concentration.

Front

What does hypotonic mean in relation to cell environments?

Back

Hypotonic refers to a solution that has a lower concentration of solutes compared to another solution, causing cells to swell.

Front

What does hypertonic mean in relation to cell environments?

Back

Hypertonic refers to a solution that has a higher concentration of solutes compared to another solution, causing cells to shrink.

Front

What does isotonic mean in relation to cell environments?

Back

Isotonic refers to a solution that has the same concentration of solutes as another solution, resulting in no net movement of water.