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3.2 Cell Membrane


Cell Membrane Structure encloses the contents of the cell: regulates & allows only certain substances through the cell membrane & the integral proteins
Fluid Mosaic moves laterally, like a ping-pong ball in water
Phospholipid Bilayer cell membrane: a double layer of phospholipid molecules
Integral (carrier) Proteins act as gates or channels to transport molecules through the membrane
Peripheral Proteins act as recognizers, receptors or cell joiners
Diffusion PASSIVE transport- NO energy because from high to low concentration; Random movement of molecules from high to low concentrations with NO additional energy
Osmosis PASSIVE transport of WATER- NO energy because from high to low concentration; diffusion of water into or out of cell; from an area of high water concentration to low (with the gradient); water moves to the most solutes
Osmotic Pressure force excerted on membrane due to movement of H2O
Hypertonic Solutions solution is high in solutes, causes cell to shrink
Hypotonic Solution solution is low in solutes, causes cell to swell
Isotonic dissolved particles outside the cell are equal to the concentration of dissolved particles in inside the cell; continued movement of molecules
Filtration passage of fluid through a membrane through mechanical pressure
Facilitated transport/diffusion PASSIVE transport- NO energy because from high to low concentration; with gradient
Active transport needs additional energy; ATP
Active transport uses energy from ATP to pass from low to against gradient; from low to high concentration with the help of a carrier protein & ATP
Sodium Potassium (Na+ K+)Pump ACTIVE transport: is carrier protein that pushes Na+ K+ into & out of the cell (against their gradient) for muscles and nerves
Endocytosis (phagocytosis) ACTIVE transport: needs ATP; plasma membrane envelopes a substance (that is too large for a carrier protein or not lipid soluable) fuses to the outside of the cell, pinches off to form a vesicle and it is released inside the cell
Exocytosis ACTIVE transport: needs ATP; a vesicle fuses to the inside of the plasma membrane and is released to the outside of the cell
Diffusion examples gases: CO2 & O2 and alcohols
Facilitated transport/diffusion: Why use carrier protein instead of going through the membrane? most solutes are not lipid soluable & must be transported (allowed) across the membrane with the help of a carrier protein (channel)
Facilitated transport/diffusion examples: amino acids & glucose
Created by: dfosterteacher



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