anatomy Ch02h - Human Anatomy McKinley & O'Loughlin...

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Human Anatomy Chapter 2: The Cell: Basic Unit of Structure and Function The Cell 0. Cells are the structural and functional units of all living organisms. Common Characteristics of Cells 0. All cells perform the general functions necessary to sustain life. Cells 1. Most cells in the human body are between 1 micrometer (μm) and 100 mm in diameter. 2. Cells vary widely in their size and shape. The Prototypical Cell 3. The generalized cell may be divided into 3 basic parts: 1. Plasma (Cell) Membrane 4. The plasmalemma 5. Major constituents are phopholipids (phospholipid bilayer) 0. Integral proteins 1. Peripheral proteins 2. Cytoplasm
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3. Nucleus Transport Across Cell Membranes Factors influencing membrane permeability: 1. Transport proteins 2. Plasma membrane structure 3. Concentration gradient 4. Ionic charge 5. Lipid solubility 6. Molecular size Passive Transport Diffusion 1. The movement of molecules down their concentration gradient 2. Equilibrium Osmosis 3.
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anatomy Ch02h - Human Anatomy McKinley & O'Loughlin...

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