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Chapter 1

Lesson 4

TermDefinition
Selectively Permeable a membrane allows specific molecules or ions to pass through it while blocking others
Passive transport moves substances across cell membranes from high to low concentration (down the gradient) without using cellular energy (ATP)
Diffusion the passive, natural movement of molecules from a high concentration area to a low concentration area, driven by their random kinetic energy, until they are evenly spread out
Active transport moves substances across cell membranes against their concentration gradient (from low to high concentration
Explain how materials move in and out. primarily through passive transport (diffusion, osmosis, facilitated diffusion, needing no energy) and active transport (requiring energy to move against concentration gradients), plus bulk methods like endocytosis/exocytosis for large items, all governed
Know the different types of membrane transport and how each works. Passive Transport (no energy, down gradient: simple diffusion, facilitated diffusion, osmosis) or Active Transport (requires energy/ATP, against gradient: pumps, endocytosis/exocytosis
Explain the difference between facilitated diffusion and duffusion. simple diffusion uses no proteins, while facilitated diffusion needs specific membrane proteins
Created by: user-1987225
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