Stacy Hernandez Period 1 Mrs. Riley AP Biology Osmosis and Diffusion Lab I. Introduction: Diffusion is vital to many life functions of a cell‚ it allow the transportation of vitally important nutrients and compounds without the expenditure of excess metabolic energy. To explain diffusion‚ it is as if a bottle of perfume is opened at one end of the room‚ then in a short amount of time a person at the other end of the room can detect the scent of the perfume; this is the process of diffusion
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membrane. To help identify the relative concentrations of solute particles of different solutions‚ we must understand that there are three possible differences in concentrations between a cell and its environment. The terms hypotonic‚ hypertonic‚ and isotonic are used in referring to the identification of the possible relative concentrations. The first term‚ hypotonic‚ is the solution that contains lower concentrations of solute particles‚ which means that the concentration inside the cell is greater
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apply to all physiological processes Physiological Processes Chemical & Physical Laws Rooted in the laws of physics & chemistry Nerve conduction‚ action potentials & ionic currents Gas exchange Animal locomotion and blood flow Muscle contraction and limb movement Anabolic and catabolic metabolism What is Animal Physiology? (continued) Animal Physiology includes behavior‚ ecology‚ anatomy‚ evolution‚….. Sub-disciplines of animal physiology Cellular Comparative Environmental
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across a selectively permeable membrane involves a special form of diffusion called osmosis. When the external and internal solute concentration are equal‚ there is no movement of water will be observed. This is described as isotonic. Osmosis does not occur in an isotonic solution‚ because the concentrations are equal on both sides of the membrane and there is no net movement of molecules from one side of the membrane to the other (Payne‚ 2007). A hypotonic solution is a solution in which the
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Discussion: Osmosis is a passive process by which water molecules move through a partially permeable membrane from a region of high concentration to a region of low concentration‚ creating an equal amount of molecules from both regions on each side of the membrane. This process is the result of a downhill energy system known as water potential. Water potential is the potential energy of water (per unit volume) that allows it to move from one area to another by osmosis. This system causes the water
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Rate of Osmosis vs Solute Concentration Introduction: In nature‚ the quest to reach equilibrium‚ or the state of rest or balance due to the equal action of opposing forces (http://www.dictionary.com). Osmosis and diffusion are two ways that cells reach this equilibrium‚ without exerting energy. Due to the unique nature of the phospholipid bilayer‚ small molecules can pass through the semipermeable membrane easily‚ through diffusion (https://www.biologycorner.com). Water‚ however‚ has a slightly more
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Bibliography: Corbis Coporation. (2009‚ September 22). Human Red Blood Cells in Physiological Isotonic Saline Solution (0.9% nacl) Sem x1000 by Dennis Kunkel Microscopy‚
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molecules‚ but not solute. The main principle of osmosis is to equalize the concentration of solute between the cells and their environment (Kent 2000). Generally‚ there are three different conditions‚ when the solution is isotonic‚ hypertonic or hypotonic to the cell. In isotonic solution‚ when water potential inside and outside the cell is equal‚ both animal and plant cell behave in the same way: there is no net movement of water. In hypertonic solution‚ when water potential of the cell is higher
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store water for later purposes. It doesn’t burst like animal cells because plant cells have a cell wall which is there for extra protection and in this case‚ it keeps the plant cell safe from bursting. The last kind of solution is called isotonic. In an isotonic situation‚ solutions have an equal concentration of solute due to water diffusing at
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the level of water in each region. Involved in this process are hypotonic‚ hypertonic and isotonic solutions. A hypotonic solution is one with a lower osmotic pressure‚ indicating that the net movement of water moves into the said solution whereas a hypertonic solution is one with a higher osmotic pressure‚ thus the net movement of water will be leaving the hypertonic solution. Lastly‚ an isotonic solution entails no net movement of water across a semi-permeable membrane as the two substances
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