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HAP 3.3

HAP 3.3. “Movement Through Cell Membranes”. I. Passive Movement. A. Diffusion 1. Def – molecules or ions spontaneously move from high to low concentrations. 2. Quick movement a. 1000 mph 3. Equilibrium – uniform distribution 4. Requirements for a cell… a. Membrane is permeable

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HAP 3.3

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  1. HAP 3.3 “Movement Through Cell Membranes”

  2. I. Passive Movement A. Diffusion 1. Def – molecules or ions spontaneously move from high to low concentrations. 2. Quick movement a. 1000 mph 3. Equilibrium – uniform distribution 4. Requirements for a cell… a. Membrane is permeable b. Concentration gradient

  3. 5. Ex: pg. 60 “consider oxygen and carbon dioxide…” B. Facilitated Diffusion 1. Require help from protein carriers 2. Ex: glucose and amino acids 3. Types: a. Channel b. Carrier c. Gate

  4. C. Osmosis 1. Def – water molecules diffuse from high to low concentrations 2. Terms… a. Isotonic = equal pressure b. Hypertonic = movement out… c. Hypotonic = movement in…

  5. II. Active Movement A. Active Transport 1. Def – moves particles from low to high concentrations. a. Requires energy (ATP) b. a.k.a.  pumps c. Include…sugar, a.a., ions d. Also used in digestion

  6. B. Endocytosis and Exocytosis 1. Endocytosis – large particle enters a. Pinocytosis – “cell drinking” b. Phagocytosis – “cell eating” c. Receptor aided – pg. 65 2. Exocytosis – large particle leaves a. Wastes and hormones

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