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 passive transport.

Back

Passive transport is the movement of substances across a cell membrane without the use of energy.

Front

Define active transport.

Back

Active transport is the movement of substances across a cell membrane using energy, typically against a concentration gradient.

Front

What is the structure of a phospholipid?

Back

A phospholipid consists of a hydrophilic (water-attracting) head and two hydrophobic (water-repelling) tails.

Front

What does hydrophobic mean?

Back

Hydrophobic refers to substances that do not mix well with water.

Front

What does hydrophilic mean?

Back

Hydrophilic refers to substances that mix well with water.

Front

What is endocytosis?

Back

Endocytosis is the process by which cells take in materials by engulfing them in a vesicle.

Front

What is exocytosis?

Back

Exocytosis is the process by which cells expel materials in vesicles.

Front

What is facilitated diffusion?

Back

Facilitated diffusion is the process of passive transport of molecules across a cell membrane via specific transmembrane proteins.

Front

What is osmosis?

Back

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