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CELLS (ORGANELLES (Endoplasmic reticulum (Smooth ER: metabolizes lipids…

- - - - Simple diffusion: requires no energy. Small uncharted molecules can pass freely through the plasma membrane
      - Facilitated diffusion: some molecules move down their concentration gradient, diffusing through the plasma membrane by moving through a specific integral protein
      - Active transport: requires cellular energy and a protein. Movement against concentration gradient
- - - - “Cell drinking” or “sampling the extracwllular fluid”
    - - Requires a protein . Is selective.
    - - “Cell eating”