AP BIOLOGY

Detailed explanation-1: -During diffusion, when the concentration of molecules on both sides of a membrane is the same, the molecules will continue to move across the membrane in both directions. When the concentration of the molecules reaches its equilibrium between the outer and inner parts of the membrane, it exists in dynamic equilibrium.

Detailed explanation-2: -Diffusion will eventually cause the concentration of molecules to be the same throughout the space the molecules occupy, causing a state of equilibrium to exist. Another type of passive transport is that of osmosis. Osmosis is the movement of water across a semi-permeable membrane.

Detailed explanation-3: -Diffusion. During diffusion, substances move from an area of high concentration to an area of low concentration, until the concentration becomes equal throughout a space.

Detailed explanation-4: -The difference in the concentration of a substance across a space is called a concentration [ equilibrium / gradient ].

Detailed explanation-5: -Since diffusion moves materials from an area of higher concentration to the lower, it is described as moving solutes “down the concentration gradient.” The end result of diffusion is an equal concentration, or equilibrium, of molecules on both sides of the membrane. At equilibrium, movement of molecules does not stop.