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Page 65
... concentrations in its environment . For example , compared to its surroundings , an animal cell has a much higher concentration of potassium ions and a much lower concentration of sodium ions . The plasma membrane helps maintain 65.
... concentrations in its environment . For example , compared to its surroundings , an animal cell has a much higher concentration of potassium ions and a much lower concentration of sodium ions . The plasma membrane helps maintain 65.
Page 71
... lower than outside it . When the cell is stimulated , gated channels that facilitate Na * diffusion open . Sodium ions then " fall " down their electrochemical gradient , driven by the concentration gradient of Na * and by the ...
... lower than outside it . When the cell is stimulated , gated channels that facilitate Na * diffusion open . Sodium ions then " fall " down their electrochemical gradient , driven by the concentration gradient of Na * and by the ...
Page 99
... tend to increase membrane fluidity ? a . a greater proportion of unsaturated phospholipids b . a greater proportion of saturated phospholipids c . a lower temperature d . a relatively high protein content in the membrane 99.
... tend to increase membrane fluidity ? a . a greater proportion of unsaturated phospholipids b . a greater proportion of saturated phospholipids c . a lower temperature d . a relatively high protein content in the membrane 99.
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active transport animal cells artificial cell blood called cotransport cell is negative Cell-Cell Recognition cellular cholesterol concentration gradient Concentrations Affect Cells Concept 7.4 Concept Check cytoplasm decreasing extracellular drive the active electrochemical gradient Endocytosis In endocytosis Energy in Active exocytosis and endocytosis extracellular solution facilitated diffusion fluid mosaic model fungi glucose Golgi hydrogen ions hydrophobic hypertonic hypotonic environment inside isotonic lipid bilayer main electrogenic pump Maintenance of Membrane membrane potential membrane proteins Membrane Structure membrane traffic move solutes nerve cell neuron occurs by exocytosis osmosis osmotic passive transport phospholipids pinocytosis plant cells plasma membrane occurs positive charge potassium ions proteins are embedded protists proton pump pump of plants Pumps Ions receptor-mediated endocytosis Salt Concentrations Affect selectively permeable Self-Quiz side where solute signal sodium-potassium pump solute(s specific transport protein store energy substance sucrose uptake sucrose-H suggested answers three sodium ions translocates transport uses energy types of endocytosis voltage Water Balance