Diffusion‚ Osmosis and Active Transport Substances will move through the membrane by diffusion. This is the random spreading out of particles until they are even. For example‚ when you put your instant coffee in boiling water‚ the coffee particles spread out and fill the entire mug‚ this is diffusion. A second way that substances can move through the cell membrane is by osmosis. This is a special type of diffusion where water moves from a high to a low concentration through a ’partially permeable
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Topic 2: Cells 2.1 Cell Theory 2.1.1: Outline cell theory Living organisms are composed of cells Cells are the smallest unit of life Cells come from pre-existing cells 2.1.2: Discuss the evidence for cell theory Humans have not been able to find any living thing that is not made up of at least one cell Robert Hooke first described cells when looking at cork through a microscope Louis Pasteur´s experiments: he discovered that all cells must come fom pre-existing cells 2.1.3: State that
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influential empires such as Imperial Rome and the Han Dynasty emerged exhibiting numerous resemblances‚ due to cultural diffusion‚ as well as various distinctions from each other regarding political control. Methods of transportation and communication benefited the government by linking and unifying crucial parts of both empires. Both empires had a system of roads that facilitated communication‚ trade‚ economic activity‚ and the movement of military. Although both empires possessed a well-organized
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Elaine N. Marieb Katja Hoehn CHAPTER PowerPoint® Lecture Slides prepared by Vince Austin‚ Bluegrass Technical and Community College Human Anatomy & Physiology SEVENTH EDITION Cells: The 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
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Why does exocytosis occur in your body? a. Once a week b. Twice a week c. On Fridays d. All day‚ every day! 8. How do endocytosis and endocytosis differ from diffusion? a. Endocytosis and exocytosis are facilitated diffusion b. They are not similar in any way c. Endocytosis and exocytosis are not facilitated diffusion d. All of the above 9. What does the white blood cell (macrophage) help you with? a. Help you stay awake b. Help your body fight infection c. Help your
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pores of the bag. Sucrose was not able to pass through as the molecules were too big to enter. This is similar to a cell because the size of a molecule can determine whether or not the substance can enter the cell through diffusion. Larger molecules will require facilitated diffusion‚ using a transport protein‚ or active transport‚ using a transport protein and also ATP (HyperPhysics.edu). Since water can pass through the dialysis
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membrane? Is this second way sufficient? Explain your answer. Since aquaporins are water channels which contain transport proteins that allow facilitated diffusion of water across the cell membrane‚ H20 is concerned it won’t be able to get across if those transport proteins are on strike. H2O crosses the plasma membrane via osmosis – also known as the diffusion of water across a cell membrane‚ and aquaporins are the “main route” for water entering and exiting the cell. Osmosis moves water in the direction
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CELLS All living things are made of cells‚ and cells are the smallest units that can be alive. Life on Earth is classified into five kingdoms‚ and they each have their own characteristic kind of cell. However the biggest division is between the cells of the prokaryote kingdom (the bacteria) and those of the other four kingdoms (animals‚ plants‚ fungi and protoctista)‚ which are all eukaryotic cells. Prokaryotic cells are smaller and simpler than eukaryotic cells‚ and do not have a nucleus. Prokaryote
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1) Homeostasis is the condition in which the body maintains a. changing state‚ within an unlimited range. b. an equilibrium point that can change over a narrow range that is compatible with maintaining life c. an equilibrium change that balances external and internal environment such that values of each are equated 2) Anabolism is the a. breakdown of matter. b. expulsion of matter. c. synthesis of matter. d. All of the answers are correct. 3) The sum
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the following is not part of facilitated diffusion? a. Solutes are moved by a change in shape in the carrier protein. b. The solute can be moved in either direction. c. The process requires energy input. d. The process is passive. A. 10.The special structures that carry materials across the cell membrane are a. proteins b. fatty acids c. phosphates d. phospholipids D. 11. Which of the following substances does not pass across membranes by simple diffusion?
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