Living Units 3 P ART A Copyright © 2006 Pearson Education‚ Inc.‚ publishing as Benjamin Cummings But First… Let’s clean up… Hydrophobic Hydrophilic Copyright © 2006 Pearson Education‚ Inc.‚ publishing as Benjamin Cummings Plasma Membrane Separates intracellular fluids from extracellular fluids Plays a dynamic role in cellular activity Just like the doors‚ windows‚ and walls of a house Copyright © 2006 Pearson Education‚ Inc.‚ publishing as Benjamin Cummings 1 Fluid
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Investigation: A factor that affects the movement of water in and out of cells. Osmosis: movement of water from a region of high water potential to a region of low water potential through a partially permeable membrane. High water potential = lots of free water molecules‚ low solute concentration Low water potential = very few free water molecules‚ high solute concentration Factors That Affect the Movement of Water in and out of Cells * Solute concentration * If one solution
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REVIEW SHEET EXERCISE 1 Cell Transport Mechanisms and Permeability 1. Match each of the definitions in Column A with the appropriate term in Column B. |Column A |Column B | |__E__ term used to describe a solution that has a lower |a. diffusion | |concentration of solutes compared to another solution |b. facilitated diffusion
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Non-cardiogenic shock is caused by a circulatory collapse in the body that is not due to problems originating in the heart. Shock is commonly caused by hypo-perfusion though the blood vessels due to lack of blood in the vessels causing low blood pressure and rapid heartbeat. Besides cardiogenic shock‚ there are three other types that cause shock for non-cardiogenic reasons‚ obstructive shock‚ disruptive shock‚ and hypovolemic shock. Obstructive shock results from an obstruction that prevents blood
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Results The objectives of this experiment were to investigate diffusion of molecules across a membrane and the factors that affect the rate of diffusion. The hemolysis time of sheep erythrocytes was measured for each of eight different nonelectrolyte solutions by eleven groups in BI 108 Section D2. These eight nonelectrolytes were urea‚ thiourea‚ methanol‚ ethanol‚ propanol‚ ethylene glycol‚ diethylene glycol‚ and triethylene glycol‚ and the mean hemolysis times can be seen below in Figure 1. The
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Exam 2 Study Guide w/ Chapters 15‚ 16‚ 17 1) Innate Immunity (p.446): A defenses against pathogens that is present at birth. Two major lines of defense; 1. Physical : Skin (epidermis + dermis) and mucous membranes 2. Internal: Cell and chemicals that inactivate or kill invaders Adaptive immunity (p.446): The body’s ability to recognize and defend itself against distinct invaders and their products. 2) Five attributes of adaptive immunity (p.471) 1. Specificity: When the immune response acts
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acetylcholine and diffuse across the neuromuscular cleft. The transmitter molecules fill receptor sites in the membrane of the muscle and increase the membrane permeability to sodium. The sodium then diffuses into the membrane and the membrane potential becomes less negative. If the threshold potential is reached‚ an action potential occurs and a nerve impulse moves along the muscle cell membrane and the muscle will contract. While skeletal muscles will only contract by neurons‚ smooth and cardiac muscles
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solution is osmotic movement of water into the cells‚ due to the cell being a hypotonic solution. Meanwhile‚ the soap solution undergoes another mechanism of lysis. The detergent from this solution causes a disruption of the lipid matrix of the cell membrane‚ resulting in the lysis. 4. Due to the solutions being hypertonic compared to the cell‚ the solutions of 2% NaCl and 5% NaCl would result in crenated
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Chapter 4: Membrane Structure and Function Fluid Mosaic Model 1. Consistency of membrane is solid enough to form a boundary‚ but flexible and permeable like a fluid. 2. Proteins scattered throughout - Embedded or on the surface - Can move around laterally 3. Phospholipid from bilayer‚ make up most of membrane 4. Glycolipids have carbohydrate chains attached. 5. Hydrophilic heads point out/into the cell 6. Hydrophobic tails point out towards each other Proteins 1. Glycoproteins: have
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BIOS 255 WEEK 5 Lab 5 - Lymphatic System & Disease Resistance 1. Describe lymphatic system functions. 1. Drains excess interstitial fluid 2. Transports dietary lipids 3. Carries out immune response 2. Locate each of the following lymphatic vessels: right lymphatic duct‚ thoracic (left lymphatic) duct‚ right and left subclavian veins‚ and cisterna chyli. a right lymphatic duct b. right and left subclavian veins c. thoracic (left lymphatic) duct d. cisterna chyli
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