The plasma membrane surrounds the cytoplasm of living cells‚ physically separating the intracellular components from the extracellular environment. It also plays a role in anchoring the cytoskeleton provide shape to the cell‚ and in attaching to the extracellular matrix and other cells to help group cells together to form tissues. The plasma membrane helps maintain homeostasis by diffusion and osmosis. Osmosis is the diffusion of water across a membrane. Diffusion is the process by which molecules
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MATERIAL AND METHODS 1. Materials: 1.1. Experimental animals: The experiment was carried out on 30 adult healthy female rats weighing 190 20g and 10 young (6-7) weeks –old male albino rats from which bone marrow mesenchymal stem cell (MSCs) were isolated. Animal were purchased from the animal house of the faculty of Medicine Mansoura University. The animals were housed in standard stainless steel cages at room temperature 25-28ﾟC‚ humidity of (50-60%) and maintained at 12 hrs alternating day
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Alex Haley: Roots Contents Page Contents 2 1. Introduction 3 2. Alex Haley: Roots 4 3. Dialogue between Kunta and his father 5 4. Kunta’s thoughts 7 5. Summary 8 Omoro said that three groups of people lived in a village. First were those you could see – walking around‚ eating‚ sleeping‚ and working. Second were the ancestors‚ whom Grandma Yaisa had now joined. “And the third people – who are they?” asked Kunta
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The Nervous System: Membrane Potential 1. Record the intracellular and extracellular concentrations of the following ions (mM/L): Intracellular Extracellular Sodium (Na+) Potassium (K+) Chloride (Cl–) 2. Excitable cells‚ like neurons‚ are more permeable to ___________ than to ___________. 3. How would the following alterations affect the membrane permeability to K+? Use arrows to indicate the change in permeability. a. An increase in the number of passive K+ channels
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excitable cells that communicate by transmitting electrical impulses that are capable of producing rapid electrical signals and depolarization in the interior surface of the membrane which becomes less negative and the exterior surface becomes less positive. Additionally‚ when depolarization reaches a certain threshold‚ an action potential is initiated and the polarity of the membrane reverses. 4. What is the difference between membrane irritability and membrane conductivity? Membrane irritability
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anything covered in lecture may appear on the exam. Membrane Transport 1. Describe the cell permeability and membrane transport. What can enter/exit the cell on its own? What requires assistance? Why? 2. Describe membrane potential. What is it? How is it established? How does it influence the transport of charged molecules? What are the components of the electrochemical gradient? 3. What are the different types of membrane transport? Describe each in detail. Which move solutes
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Psychology What is psychology? The scientific study of mental processes and behaviour To understand a person a psychologist must investigate an individual’s...? Biology‚ psychological experiences‚ and cultural context. What are two aspects which create possibilities and limitations to an individual’s psychology? Biology and cultural experience. Biologically the structure of the brain sets the parameters or limits of human potential. Cultural experience shapes the groundwork for different kinds
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How do taproot and fibrous root systems help plants survive and reproduce? b. Would one type of root system provide an adaptive advantage in a particular environment such as a rain forest? tapmore volume 2. a. In the space below‚ sketch the root tips that you examined. In which root tip are cells largest? In which area are they smallest? b. Aside from their size‚ do all cells in the root tip appear similar? Why is this significant? No‚ because different cells have different functions; however
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Name: ______________________________________ Date: ________________________ Student Exploration: Osmosis Vocabulary: cell membrane‚ concentration‚ diffusion‚ dynamic equilibrium‚ osmosis‚ semipermeable membrane‚ solute‚ solvent Prior Knowledge Questions (Do these BEFORE using the Gizmo.) 1. Suppose you were trapped on a desert island with no sources of fresh water. Should you drink water from the ocean? Explain why or why not. _________________________________________________________________________
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recorded in a table. Discussion: In the experiment‚ I believe the phenomenon to take place is osmosis. Osmosis is the movement/diffusion of water molecules through a selectively permeable membrane from an area of high concentration of water molecules (high water potential) to an area of a low concentration of water molecules (low water potential). From previous knowledge I know when a plant cell is put into a solution with the same concentration as the cell contents‚ this is referred to as isotonic
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