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Questions
• Describe how the cell membrane helps maintain homeostasis.
• Explain what affect more cholesterol would have on the cell membrane.
• Explain what the proteins in the cell membrane do.
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Explain how the cell membrane helps maintain homeostasis.
Agenda for Thursday Nov 19th 1.Quiz2.Start Gummy bear lab3.Diffusion/osmosis notes
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Vocab• Solute – stuff we want to dissolve
• Solvent – substance in which something dissolves
• Concentration – amount of a solute dissolved in a given volume of solution– A lot = concentrated– A little = dilute
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Passive transport• No energy needed
• Particles move from high concentration to low concentration
• Particles flow until equilibrium is reached– No change in concentration on each side
• Diffusion = particles moving across membrane• Osmosis = water moving across membrane
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Diffusion and Membrane• Membrane has selective permeability – Polar/nonpolar regions on lipid bilayer
Cannot pass through:• Ions (salts dissolved in water)• Hydrophilic molecules (glucose)• Macromolecules
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Facilitated Diffusion
• Protein in membrane move particles across
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Facilitated Diffusion
• Carrier proteins – Change shape
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Osmosis• Diffusion of water across membrane
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What is wrong with the cartoon?
Agenda for Friday Nov 20th 1.Go over cell worksheets2.Finish gummy bear lab3.Finish notes4.Osmosis practice sheet
Test Tuesday 10
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Osmosis
• Isotonic – concentration of solute is the same inside and outside cell– Water enters and leaves at same
rate
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Osmosis• Hypotonic – concentration of solute
is greater inside the cell, more water outside cell– Cells gain water– Animal cells can burst – Cell wall prevents plant cells from
rupturing• Turgor pressure supports the cell• A cell under pressure is turgid
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Osmosis
• Hypertonic – concentration of solute is greater outside the cell– Cells lose water– Animal cells shrivel up– Plants: membranes pulls away from
the cell wall• The cell wall is rigid and does not shrink
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Active Transport
• Substances moving from low to high concentrations– Need energy
• Use proteins in membrane
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Na/K ATPase Pump
• Found in animal cells
• Helps maintain levels of sodium and potassium
• Uses energy (ATP) to move 3 Na ions out of the cell and 2 K into the cell
• High levels of sodium on outside creates a gradient16
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Coupled Transport
• Linked, simultaneous transport of two substances across a cell membrane
• Create a high concentration gradient on 1 side– Protein channels open & allow other particles
(sucrose/sugar) to move across membrane– Spend very little energy
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Transport of Large ParticlesEndocytosis –brings substance into cell
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Transport of Large ParticlesExocytosis – expels stuff from cell– waste, substances (hormones) produced by cell
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In passive transport, particles move from what to what
concentration?
Agenda for Monday Nov 23rd 1.Go over homework2.Go over lab3.Review stuff
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