Chapter 8.4 Active & Vesicular Transport

Vocabulary flashcards covering Chapter 8.4 study guide on active transport, exchange pumps, vesicular transport, endocytosis, and exocytosis.

Active Transport

A process that requires energy from ATP to move substances against a concentration gradient.

ATP

The molecule that provides cellular energy required for active transport and vesicular transport.

Ion Pump

A cellular mechanism that moves essential ions from one side of a membrane to the other.

Exchange Pump

An ATP-driven counter-transport mechanism that moves substances in opposite directions across a membrane.

Sodium-Potassium Exchange Pump

The best example of an exchange pump, which uses ATP to move ions across the cell membrane as a type of active transport.

Vesicular Transport

A process that moves larger amounts of material into or out of a cell using small membrane sacs called vesicles.

Vesicle

A small membrane sac used to package and transport material into or out of a cell.

Endocytosis

A category of vesicular transport that requires cellular energy (usually ATP) to package external material into vesicles and move it INTO the cell.

Exocytosis

A category of vesicular transport that requires ATP to move material OUT of the cell when a vesicle merges with the cell membrane.

Phagocytosis

A type of endocytosis described as "cell eating".