Physiology Zoology 203

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PhysiologyZoology 203

• Palomar Community College
• Dr. Kevin Krown
• Office Hrs during Lab
• Email kkrown_at_sunstroke.sdsu.edu
• Phone [phone]

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Cell Membrane Transport
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Body Fluid Compartments

• Intracellular (ICF)
• Extracellular (ECF)
• Interstitial
• Plasma

Figure 5-13
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Overview of Movement Across Membranes

• Energy requirements
• Physical requirements

Figure 5-14
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Diffusion Passive down a concentration
gradient

• Stops at equilibrium
• Rate factors membrane, temperature, distance,
  size

Figure 5-16
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Carrier Mediated Transport Can be Passive or
Active

• Uniport
• Cotransport
• Symport
• Antiport

Figure 5-17
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Facilitated Diffusion

• Uses transport (integral) proteins
• Passive Diffusion

Figure 5- 21
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Facilitated Diffusion
Figure 5-22
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Primary Active Transport Pumps Products of the
Cell

• Na-K ATPase
• Uses ATP to move products against a concentration
  gradient

Figure 5-23
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Primary Active Transport
Figure 5-24
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Secondary Active Transport Uses Energy of ion
gradient

• Na-glucose symport
• Cotransports
• Ion restored
• using ATP

Figure 5-25
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Energy Transfer in Cells

• Cell metabolism
• Membrane transport

Figure 5-26
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Endocytosis and Exocytosis Movement of large
molecules across membranes3 possible mechanisms

• Endocytosis
• Phagocytosis large particles (e.g. bacteria)
• Pinocytosis non-selective molecules
• Receptor mediated specific substrate
• Exocytosis
• Export of lipophobic substances (e.g. proteins)

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Receptor-mediated Endocytosis (LDL Receptor)
Figure 5-28