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The cell membrane engulfs a substance to bring it inside.
To truly understand the definition, it helps to see how it differs from its counterpart: Active Transport Passive Transport Against the gradient (Low to High) With the gradient (High to Low) Energy Required? Proteins Needed? Yes (Specific carrier proteins) Sometimes (Channel proteins) Examples Sodium-Potassium pump, Endocytosis Diffusion, Osmosis
The cell membrane engulfs a substance to bring it inside.
To truly understand the definition, it helps to see how it differs from its counterpart: Active Transport Passive Transport Against the gradient (Low to High) With the gradient (High to Low) Energy Required? Proteins Needed? Yes (Specific carrier proteins) Sometimes (Channel proteins) Examples Sodium-Potassium pump, Endocytosis Diffusion, Osmosis definition for active transport