Unit 3 Homeostasis & Cell Transport Review

Front

What is homeostasis?

Back

Homeostasis is the process by which living organisms maintain a stable internal environment despite changes in external conditions.

Front

Define passive transport.

Back

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

Front

What is active transport?

Back

Active transport is the movement of substances against a concentration gradient, requiring energy, usually in the form of ATP.

Front

What is osmosis?

Back

Osmosis is the diffusion of water molecules through a selectively permeable membrane from an area of lower solute concentration to an area of higher solute concentration.

Front

What is facilitated diffusion?

Back

Facilitated diffusion is a type of passive transport that uses transport proteins to help move molecules across the cell membrane.

Front

What role do mitochondria play in cellular transport?

Back

Mitochondria provide the energy (ATP) required for active transport processes in cells.

Front

What is exocytosis?

Back

Exocytosis is the process by which a cell expels materials in vesicles that fuse with the cell membrane.

Front

What is endocytosis?

Back

Endocytosis is the process by which a cell takes in materials by engulfing them in a vesicle.

Front

What is the difference between diffusion and osmosis?

Back

Diffusion is the movement of solutes from an area of higher concentration to an area of lower concentration, while osmosis specifically refers to the movement of water.

Front

What is a concentration gradient?

Back

A concentration gradient is the difference in the concentration of a substance across a space, which drives the movement of molecules.