Chapter2CellMarieb - Goals: Anatomy of a typical cell Cell...

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Goals: •Anatomy of a typical cell •Cell Membrane •Discussion of internal structure of a cell with emphasis on the various organelles Developed by John Gallagher, MS, DVM
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1. Cells are the smallest living structure 2. Cell = functional unit of the body 3. Cytology = The Study of Cells 4. Ultrastructural Cytology = Cytology at the Electron Microscopic level 5. Histology = the study of tissues (next meeting) Some Terminology:
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Anatomy of a typical cell 1. Cell membrane 2. Cytoplasm = cytosol + organelles 3. Organelles •Smallest: •Granule cell in cerebellum: 4 μ •RBC: 5-7 μ = 0.005-0.007 mm •Largest: •Anterior horn cell in spinal cord: 135 μ •Ovum: 120 μ = 0.12 mm •Longest: •Pseudounipolar cell (CNS to toe) Fig. 2.1
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Anatomy of a typical cell, cont’d _ Shapes: Squamous (scale) - flat, capillaries, lungs Cuboidal - lines ducts Columnar - length > width, digestive tract Stratified - many layers – Many others will be covered in histology (next two lectures)
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Cell Membrane = phospholipid bilayer _ Physical isolation of the cell contents from the environment (interstitium ) _ Regulation of exchange of materials with the environment _ Sensitivity to changes in the environment _ Structural support of the cell – Organelles, too!
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Cell Membrane Synonyms: •plasma membrane •plasmalemma •axolemma •others
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Chapter2CellMarieb - Goals: Anatomy of a typical cell Cell...

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