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The cell swells because of the extrawater that enters. In a hypotonicsolution, the concentration of dissolved substances is lower outside of the cell than inside. Because the amount of water moving inand out of the cells is the same, the cells keep their normal shape.When a cell is floating in a hypotonic solution, more waterenters the cell through osmosis than leaves it. In an isotonicsolution, dissolved substances inside and outside of the cell havethe same concentration. When a cell is floating in an isotonic solution, the watermoves in and out of the cells at the same rate. Rereadany sentences you highlighted.How does osmosis affect cells?Most cells undergo osmosis because they are floating in watersolutions. Homeostasis is the regulation of the cell’s internal environment.Read forUnderstanding As you readthis section, highlight any sentence that you reread. This waterflow through the membrane helps create homeostasis. The movement of water from an area of higher concentration to an area of lower concentration, or diffusion, across theplasma membrane is called osmosis (ahs MOH sus). This means only certain particles, or molecules, arelet in and out of a cell.Water is the only substance the plasma membrane always allowsin or out. When are things easily transported? When it is more difficult, what types of equipment might be used to help move thingsalong? Write your thoughts on the lines below._◗ Read to LearnCopyright © by Glencoe/McGraw-Hill, a division of The McGraw-Hill Companies, Inc.Osmosis: Diffusion of WaterThe plasma membrane of a cell is called a selectively permeablemembrane. Thinkabout the ways you have seen things being moved from place to place. You will learn how substances move in and out of cells. Identify the structure and specifictask for the various parts of a eukaryotic cell.Eukaryotic Cell StructureCell PartStructureTaskcell wallchromatinnucleusnucleolusribosomescytoplasmnuclear envelopeendoplasmic reticulumGolgi apparatusvacuolelysosome78Chapter 7Copyright © by Glencoe/McGraw-Hill, a division of The McGraw-Hill Companies, Inc.Visit the Glencoe Science Web site at find your book and learn more about eukaryotic cell structure.READING ESSENTIALSNameDateClassSection8.1 Cellular TransportSC.F.1.4.8 The student knows that cell behavior can be affected by molecules from other parts of the organism or evenfrom other organisms.◗ Before You ReadThis section is about cell transport. Use the chart to help you review what you have learned. Be sure to tell how the work of one structure relates to the work of the other._READING ESSENTIALSChapter 777NameDateClassSection7.3Eukaryotic Cell Structure, continued3.