Membrane Transport: Osmosis and Diffusion

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Osmosis definition

Back

of water molecules across a semipermeable membrane from high to low water concentration

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Diffusion definition

Back

of particles from an area of high concentration to low concentration

Front

Active transport definition

Back

of substances against concentration gradient using energy (ATP)

Front

Example of active transport

Back

pump in nerve cells

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Osmosis vs. diffusion (medium)

Back

involves water; diffusion involves any particles

Front

Osmosis vs. diffusion (membrane)

Back

requires semipermeable membrane; diffusion may not

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Types of membrane transport

Back

osmosis, active transport

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Importance of membrane transport

Back

cell homeostasis and nutrient/waste exchange

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Energy requirement: diffusion vs. active transport

Back

no energy; active transport: requires energy

Front

Concentration gradient in osmosis

Back

moves from high to low water potential (low solute to high solute)