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30 Cards in this Set
- Front
- Back
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what is the purpose of a cell membrane?
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to selectively compartmentalize the constituents of life away from environmental lifelessness
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what is a cystol?
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intra celular fluid
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what regulates cell volume?
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the cell mambrane
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How is the intra cellular environment regulated
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Cell membranes regulate the intracellular environment by creating and maintaining concentration differences between the intracellular and extracellular solutions
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Na+
Concentration in the Extracellular Fluid |
142 mM
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K+
Concentration in the Extracellular Fluid |
4 mM
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Ca
Concentration in the Extracellular Fluid |
1 mM
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Cl
Concentration in the Extracellular Fluid |
105 mM
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H+
Concentration in the Extracellular Fluid |
40 nM
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Ph in the Extracellular Fluid
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7.4
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osmolarity in the Extracellular Fluid
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290
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where is K+ concentration higher?
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inside the cell
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where is Na- concentration higher?
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outside the cell
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where is Ca++ higher?
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outside the cell (1000x)
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where is Cl- higher?
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Outside the cell
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which fluid is slightly alkaline (ICF or ECF)
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ECF
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Which 2 properties are about equal in ICF and ECF?
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osmolarity and charge
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how do Hydrophobic (water hating) solutes get across the lipid bilayer ?
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dissolve in the phospholipid bilayer and diffuse across.
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How do Ions, hydrophilic (water loving) solutes and water get across the lipid membrane?
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They cross membranes by routes through integral proteins. These routes have been called "channels" and "pores"
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why does cell volume mater?
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Changes in cell volume may alter intracellular solute concentrations which may alter cell function
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what is the purpose of the kidney?
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to regulate extra cellular fluid volume and composition
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what is an aquaporin?
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a special water diffusion pathway
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what 2 types of molecules make up the plasma membrane?
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Lipids and proteins
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why is the phospholipid head hydrophilic?
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it has a positive and negative charge
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what makes the membrane more fluid?
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unsaturated fatty acids
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how much of the membrane is cholesterol?
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20%-50%
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what make the membrane less fluid?
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cholesterol and saturated fat
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How could high cholesterol impair your immune response?
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A decrease in the membrane fluidity resulting from an increase in membrane cholesterol will impair the response of the immune system to an antigen
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what are 2 ways in which membrane protein channels are regulated?
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by voltage or the binding of certain small molecules
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what is a membrane pore?
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hydrophilic pathways through the membrane that are not regulated like channels
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