chapter5a Membrane Dynamics 1

chapter5a Membrane Dynamics 1 - Chapter 5a Membrane...

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Chapter 5a Membrane Dynamics
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About this Chapter Mass balance and homeostasis Diffusion Protein-mediated, vesicular, and transepithelial transport Osmosis and tonicity The resting membrane potential Insulin secretion
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Mass Balance in the Body Figure 5-2 (through intestine, lungs, skin) (by kidneys, liver, lungs, skin) BODY LOAD Metabolic production Metabolism to a new substance Mass balance Existing body load Law of Mass Balance + Intake or metabolic production Excretion or metabolic removal = Intake Excretion
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Mass Balance and Homeostasis Clearance Rate at which a molecule disappears from the body Mass flow = concentration  volume flow Homeostasis  equilibrium Living things not EQ across membranes Osmotic equilibrium Where? Chemical disequilibrium Electrical disequilibrium Where?
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Homeostasis Figure 5-3a
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Homeostasis vs Equlibrium Figure 5-3b Compare: ECF vs ICF I vs P
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Figure 5-4 Diffusion Map of membrane transport Active vs Passive Uses energy of molecular motion. Does not require ATP Diffusion Simple diffusion Facilitated diffusion Phagocytosis Exocytosis Endocytosis Secondary active transport Primary active transport PHYSICAL REQUIREMENTS Mediated transport requires a membrane protein Molecule goes through lipid bilayer Uses a membrane-bound vesicle Requires energy from ATP ENERGY REQUIREMENTS MEMBRANE TRANSPORT creates concentration gradient for
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1. Passive process 2. High concentration to low concentration 3. Net movement until concentration is equal 4. Rapid over short distances 5. Directly related to temperature How?
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chapter5a Membrane Dynamics 1 - Chapter 5a Membrane...

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