The process that occurs when a physical pressure pushes materials through a barrier is called
A) diffusion.
B) facilitated diffusion.
C) osmosis.
D) filtration.
E) active transport.

Question

Quizplus · Accepted Answer

The process described in the question is filtration. Filtration is the movement of materials through a barrier driven by a physical pressure, such as blood pressure in the kidneys causing urine to be filtered out. Diffusion and facilitated diffusion involve the movement of materials from an area of high concentration to an area of low concentration, without the need for a physical pressure. Osmosis is the movement of water across a selectively permeable membrane from an area of low solute concentration to an area of high solute concentration. Active transport requires the use of energy to move materials against a concentration gradient.

The Process That Occurs When a Physical Pressure Pushes Materials