Chapter 2: Passive and Active Transport

What do cell membranes do?

They allow cells to maintain internal environments different from the external environment

What is passive transport?

Is the process by which molecules or ions diffuse across a membrane from high to low concentration

What is diffusion?

Is a natural phenomenon where particles spread out from high to low concentration

True or false: Because particles are moving with the concentration gradient, no energy input is required

True

What is gradient?

Is the difference in concentrations between two different areas, a larger difference indicates a steeper gradient and a faster rate of diffusion

What is true about passive transport?

It plays a significant role in absorbtion of nutrients and removal of wastes

What does active transport do?

Moves molecules against a concentration gradient, from low to high concentration

What is true of active transport?

Active transport requires an energy input form the environment