Lab 2 - Lab II Cell Transport Review from last weeks lab...

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Lab II Cell Transport
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Review from last week’s lab 1)Which organ system does the thyroid belong to? 2) What is the function of the coarse adjustment knob? 3) What is the name of the anterior body landmark pertaining to the cheek? Great toe? Sole of foot? Hand? Kneecap region? 1) What is the function of spleen? 2) What is the function of lysosomes 3) 600g= mg 4) A plane running horzontally is diving the body into superior and inferior parts is called what? 5) Define Parfocal:- 6) What is the funtion of Endoplasmic Reticulum? 7) What happens during Late Prophase?
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Cell Transport Plasma membrane selectively permeable controls what enters or leaves cell Passive transport requires no ATP movement down concentration gradient simple diffusion and filtration Active transport requires ATP movement against concentration gradient carrier mediated (facilitated diffusion and active transport) vesicular transport
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Passive transport:- Filtration Movement of particles through a selectively permeable membrane by hydrostatic pressure Examples filtration of nutrients from blood capillaries into tissue fluids filtration of wastes from the blood in the kidneys
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Passive transport:- Simple Diffusion Net movement of particles from area of high concentration to area of low concentration due to their constant, random motion Also known as movement down the concentration gradient
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Diffusion Rates Factors affecting diffusion rate through a membrane temperature - temp., motion of particles molecular weight - larger molecules move slower steepness of concentrated gradient - difference, rate membrane surface area - area, rate membrane permeability - permeability, rate
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Membrane Permeability Diffusion through lipid bilayer Nonpolar, hydrophobic substances diffuse through lipid layer Diffusion through channel proteins water and charged hydrophilic solutes diffuse through channel proteins
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Passive Transport:- Osmosis Diffusion of water through a membrane from area of more water to area of less water Aquaporins = channel proteins specialized for osmosis
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Tonicity Tonicity - ability of a solution to affect fluid volume and pressure within a cell depends on concentration and permeability of solute Hypotonic solution low concentration of nonpermeating solutes (high water concentration) cells absorb water, swell and may burst (lyse) Hypertonic solution has high concentration of nonpermeating solutes (low water concentration) cells lose water + shrivel (crenate) Isotonic solution = normal saline
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Tonicity and RBC’s Hypotonic, isotonic and hypertonic solutions affect the fluid volume of a red blood cell. Notice the crenated and swollen cells.
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Proteins carry solutes across cell membrane Specificity solute binds to a specific receptor site on carrier protein differs from membrane enzymes because
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This note was uploaded on 02/25/2011 for the course BIO 210 taught by Professor Parreve during the Fall '10 term at CUNY Hunter.

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Lab 2 - Lab II Cell Transport Review from last weeks lab...

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