3.1 Diffusion

Front

Atoms

Back

The basic building blocks of matter.

Front

Concentration

Back

The amount of a substance present in a given volume.

Front

Concentration Gradient

Back

The difference in concentration of a substance between two regions.

Front

Diffusion

Back

The net movement of particles from a region of higher concentration to a region of lower concentration, down a concentration gradient, due to their random movement.

Front

Diffusion Distance

Back

The length or thickness that particles must travel to diffuse from one point to another.

Front

Ions

Back

Atoms or molecules that have gained or lost one or more electrons, resulting in a net electrical charge.

Front

Kinetic Energy

Back

The energy possessed by an object due to its motion.

Front

Membrane (Permeable)

Back

A thin layer that allows substances to pass through it.

Front

Microvilli

Back

Tiny, finger-like protrusions on the surface of some cells, which increase the surface area for absorption.

Front

Molecules

Back

Groups of two or more atoms held together by chemical bonds.