Chap3_2401 - Chapter 3 1 THE CELLULAR LEVEL OF ORGANIZATION...

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C h a p t e r 3 1 THE CELLULAR LEVEL OF ORGANIZATION Chapter 3 Anatomy and Physiology Lecture
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C h a p t e r 3 2 THE CELLULAR LEVEL OF ORGANIZATIOM Functions of the Cell 1. Basic unit of life 2. Protection and Support 3. Movement 4. Communication 5. Cell metabolism and energy release 6. Inheritance How We See Cells 1. Light microscope 2. Electron microscope 3. Scanning electron microscope (SEM) 4. Transmission electron microscope (TEM) Summary of Cell Parts 1. Plasma membrane . The outer, limiting membrane separating the cell's internal parts from the extracellular materials and external environment. 2. Cytoplasm: Cytoplasm . The substance that surrounds organelles and is located between the nucleus and the plasma membrane. All cellular contents located between plasma membrane and nucleus. Cytosol - the thick semifluid portion of the cytoplasm; which is intracellular fluid. 3. Cytoplasm: Organelles . Permanent structures with characteristic morphology that are highly specialized for specific cellular activities. 4. Nucleus . The secretions and storage products of cells.
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C h a p t e r 3 3 PLASMA (CELL) MEMBRANE Plasma Membrane , Cell Membrane , or Plasmalemma is the thin barrier that separates the internal components of a cell from the extracellular material and external environment. Fluid Mosaic Model of membrane structure describes the molecular arrangement of the plasma membrane and other membrane in living organisms. ( Mosaic is a pattern of many small pieces fitted together). Fluid mosaic model describes membrane as a mosaic of proteins floating like icebergs in a sea of lipids . A. Membrane Chemistry and Anatomy By weight , plasma membrane of typical animal cells are about 50:50 mix of proteins and lipids . Proteins and Lipids are held together by noncovalent interactions. (Since proteins are larger and more massive than lipids, however, there are about 50 lipid molecules for each protein molecule). Membrane Lipids (a) Phospholipids (lipids that contain phosphorous) consist of about 75% of the lipids Phospholoids line up in two parrallel rows, forming a Phospholipid (lipid) bilayer . Phospopholids are amphipathic (that is, they have both polar and nonpolar regions.
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C h a p t e r 3 4 Polar part is the phosphate-containing “head”, which is hydrophilic (mixes with water). Nonpolar parts are the two fatty acid “tails”, which are hydrophobic (do not mix with water). (b) Glycolipids (Combination of Carbohydrate and Lipids) consist of 5% of membrane lipids. Glycolids, like phospholids are also amphipathic. Functions : (1) Are important for adhesion among cells and tissues. (2) May mediate cell-to-cell recognition and communication. (3) Contribute to regulation of cellular growth and development. (C)
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This note was uploaded on 03/10/2012 for the course BIOL 2403 taught by Professor Campbell during the Spring '12 term at Texas Pan American.

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Chap3_2401 - Chapter 3 1 THE CELLULAR LEVEL OF ORGANIZATION...

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