The factors that would cause the lung to collapse are elastic recoil and high surface tension. And the factors that prevent the lungs from collapse are negative intrapulmonary pressure and surfactant. During expiration : volume increase and pressure decrease During inspiration : volume decrease and pressure increase The role of surfactant is to decrease surface tension by more than 40 times. And it’s effect on surface tension is to prevent them from PO2 in alveolar : 104 PO2 in venous blood
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Research for Educational Reform 25 Area and Perimeter: "Which is Which and How Do We Know?" Helene Sherman Tammy Randolph University of Missouri - St. Louis Fourth grade students participated in three hands-on lessons designed to foster conceptual understanding of area and perimeter‚ to able to measure them in units and to be able to distinguish them from each other within the same figure. Students worked with a university faculty member and classroom teacher to construct shapes on geoboards
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Title: Potato Osmosis Abstract: In this experiment was designed to study the effect of a concentrated solution applied to white and sweet potatoes. The solution’s impact among the potatoes were to be either hypertonic‚ hypotonic‚ or isotonic. The potatoes were first cut into fries with a fry cutter‚ and then weighed after being cut. The white and sweet potatoes’ weights ranged from .005-.015 grams. A total of 18 sugar solutions are to be made over the course of 3 trials. In each trial‚ 6 different
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Making a Potato Powered Light Bulb Materials: A large potato Two pennies Two zinc-plated nails or screws Three pieces of copper wire A very small light bulb or LED light 1) Get a potato and cut it in half. Then make a small slit in each half just big enough to put a penny into. 2) Cut two pieces of copper wire and wrap one around one of the pennies a few times‚ and wrap the other one around the other penny a few times as well. 3) Take a third piece of copper
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A sugar cube is a carbohydrate made of moistened sugar. For something to be a living thing‚ it has to have cellular organization‚ contain similar chemicals‚ and have the abilities to reproduce‚ evolve‚ use energy‚ grow‚ and respond. A sugar cube has several of these characteristics‚ raising the question of whether it is living or not. As mentioned before‚ a sugar cube shares several characteristics with living things. For example‚ evolution is the ability to change over time. Both humans and sugar
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able to do the following. • • Explain the use of the surface heat transfer coefficient. • Explain the use of the overall heat transfer coefficient. • Combine convection and conduction theory to solve problems involving flat‚ cylindrical and spherical surfaces. • Explain the basic theory behind radiated heat transfer. • Explain the affect of the emissivity and shape of the surface. • Calculate effective surface heat transfer coefficient. • (c) D. J. Dunn Explain
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project is on the surface tension of water and what affects the surface tension of water. The question that I am going to ask is how does temperature and salinity of water affect the surface tension of the water. My hypothesis is that the colder and the saltier that the water is‚ the stronger that the surface tension of the water will be. Some of the background research that I have done has explained to me that the surface tension of water is a property of a liquids surface that can cause it to
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Mining is the process of digging beneath surface of the earth and extracting minerals and other useful geological materials. There are two main categories that mines fall into; surface mines and underground mines. Surface mines are effective at extracting minerals and geological materials that are close to the surface of the earth while underground mines are designed to extract minerals and geological materials that are deep beneath the surface of the earth. One of the most common materials that
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distilled water‚ 0.4% NaCl‚ and 0.9% NaCl would all appear to be inflated and could burst. This is due to the fact that the solution is hypotonic to the potato‚ thus water is entering the cell. Meanwhile‚ the cells in the solutions 5% NaCl and 10% NaCl would have shriveled cells. This is because the solution is hypertonic and water is leaving the potato out into the solution. Record the Lysis Time: Solution Lysis Time (min) DI 1:36 Soapy Water 0:48 0.2% NaCl 4:30 0.4% NaCl NL 0.6% NaCl NL 0.9% NaCl
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Seamus Heaney – ‘At a Potato Digging’ • Context • • The poem deals with two different potato harvests. One is the harvest from the present day that goes successfully and which delivers a rich crop. The second potato harvest looks back to the famine of 1845 when the crop failed and many people starved. Whilst the famine is no longer a threat‚ its ongoing fear remains and this can be seen in the use of religious language throughout the poem. For example‚ the bowed heads of the potato pickers suggest the
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