Unit 3 Vocab-Flashcards

Front

Active transport

Back

The movement of molecules against their concentration gradient, requiring energy.

Front

Passive transport

Back

The movement of molecules across a cell membrane without the use of energy.

Front

Facilitated diffusion

Back

The process of transporting molecules across a membrane via protein channels.

Front

Simple diffusion

Back

The movement of molecules from an area of high concentration to an area of low concentration.

Front

High to low passive

Back

The direction of movement in passive transport.

Front

Low to high active

Back

The direction of movement in active transport.

Front

ATP

Back

Adenosine triphosphate, the energy currency of the cell.

Front

Homeostasis

Back

The maintenance of a stable internal environment in an organism.

Front

Endocytosis

Back

The process by which cells take in substances by engulfing them.

Front

Exocytosis

Back

The process by which cells expel substances.