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Understanding Cell Membranes and Transport Mechanisms

Learn about passive and active transport processes in cell membranes. Discover how materials move in and out of cells through diffusion and active transport, utilizing protein channels and receptor-mediated endocytosis. Explore concepts such as phagocytosis, pinocytosis, and exocytosis.

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Understanding Cell Membranes and Transport Mechanisms

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  1. Cell Membranes and Transport Getting material in and out of cells

  2. Transport • Getting material in and out of cells • Can be broken into two categories

  3. Passive Transport • Movement of material in/out of cells • CELL USES NO ENERGY TO DO SO • Diffusion: (From Hi  Lo) • Down the concentration gradient.

  4. Active Transport • Cell USES ENERGY to move material in/out cells. • “Up” the concentration gradient: (Lo  Hi) • Uses the protein channels in the cell membrane.

  5. Active Transport • Receptor Mediated Endocytosis – Bringing large molecules or chunky bits into the cell. • Cell surrounds and “engulfs” the material • Phagocytosis – Cellular “eating” • Pinocytosis – Cell “drinking” • The reverse process is called Exocytosis – Cell “Pooping” Animation

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