Exercise 5A

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Exercise 5A
The Cell Transport and Membrane Permeability
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There are two general categories of cellular
transport mechanisms
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Types of transport

• Passive
• Simple diffusion
• Facilitated or protein mediated
• Filtration
• Osmosis
• Active
• ATP driven solute pumps
• Vesicular
• Endocytosis
• Phagocytosis
• Bulk-phase endocytocysis (pinocytosis)
• Phagocytosis

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Rate of diffusion is influenced by

• concentration
• temperature
• molecular or atomic weight of solute
• density of solvent
• gases allow for the quickest
• liquids are intermediate
• solids allow for the slowest

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Diffusion
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Diffusion of dye in agar
Methylene blue
KMnO2
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Facilitated diffusion
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Osmosis a.
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Osmosis b.
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Whats an Osmometer?
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Normal erythrocytes in an isotonic solution
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RBCs in hypertonic saline solutioncrenation
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Isotonic vs hypotonic
Normal RBCs 0.9 NaCl
Hemolysis Distilled water
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Active transport requires cellular energy
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Exocytosis
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Endocytosis (a.k.a. pinocytosis)
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Phagocytosis cellular eating
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Active transport AntiportThe sodium/potassium
pump
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Active transport SymportThe sodium/glucose
symporter
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Transport Animations
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cmf1a.htm