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Transcript
Chapter 5 A Journey into the Eukaryotic Cell Mrs. Park December 2015 Lesson 1 and 2: Cell Membrane and Transportation • Objectives: 1. Explain the bilayer structure of cellular membranes. 2. Identify the function of other molecules found in the cellular membrane. 3. Describe a cell’s inside environment. Lesson 1 Vocabulary • • • • • • • Bilayer Plasma membrane Fluid mosaic model Transport protein Extracellar matrix Cytoplasm Cytosol Cell Membrane Structure • Membranes are made of phospholipids. • A lipid molecule with a head and a tail. • The head is polar (has a charge) and water hydrophilic (water-loving) • Tail has no charge and is hydrophobic (waterhating). The Membrane • Bilayer • Two layers • Heads on the outside, so they can touch water-based solutions. • Tails on the inside, prevent water from passing through. Membrane Location • Surrounds the cell of animals and humans. • Surrounds organelles, specialized structures in cells (nucleus, mitochondria, and others) Cell Membrane Function • Hydrophilic outside lets the membrane and organelles interact with water-based solutions. • Hydrophobic inside limits what can enter or exit the cell. • Cell membrane is also called the plasma membrane Selectively Permeable Membrane • The membrane blocks some molecules because of their size or shape. Transport Helpers • Proteins in the membrane often help move molecules through the membrane. • Proteins in the membrane that help move molecules across are transport proteins. Extracellular Matrix • Animal cells have a sticky coating on the outside of the cell. • Has fibers in it that help hold the cells together. • Allows molecules to pass from one cell to another. Inside the Plasma Membrane • Inside cells is cytoplasm, a jelly-like fluid. • Cytoplasm is made up of cytosol. Chapter 5 Lesson 2 In and out of the Cell • • • • In and out of the cell: Passive Transport Facillitated diffusion Active transport