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chapter 02 cells the living units

chapter 02 cells the living units - Plasma(cell Membrane...

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1 Cells: the living units Chapter 2 Cytology History of cellular research Cells Metabolism Cellular function – nutrients – oxygen – ability to eliminate wastes Cells The cell is the most basic unit of human life. – alive – most reproduce – most live in a liquid environment Cellular diversity – many different functions – we’ll study what most cells have Common Characteristics Plasma (cell) membrane – protective barrier – pliable with small holes (permeability for metabolic processes) Cytoplasm – cytosol: clear, thick, elastic fluid (blood of cell) – contains cellular materials (organelles) – delivers nutrients and waste products Nucleus – controls chemical and reproductive activities Common characteristics
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Unformatted text preview: Plasma (cell) Membrane Mechanics of the Plasma membrane: bulk transport Mechanics of the Plasma membrane: bulk transport Cellular Replication Mitosis – growth & replacement of damaged or worn cells – 100 billion cells replaced each day Cellular Replication Constant – epidermal, hemopoietic, lining of gastrointestinal tract As needed – liver, kidneys Never – muscle, nerve Cellular Adaptations Hypertrophy Atrophy A clinical consideration: Cancer Neoplasm – uncontrolled growth resulting in tumors – benign: slow, contained growth – malignant: rapid growth with possibility of spreading ( metastasize) 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15...
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