BIOL 339 Chapter Notes - Chapter 6: Microfilament, Membrane Potential, Resting Potential
30 Sep 2016
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Document Summary
Movement of cells is directly or indirectly traced back to the cytoskeleton and motor proteins. Sliding filament model: myosin forms cross-bridges with actin. Changes cause myosin to walk along the microfilament. Regulation by thick and thin filaments: ca2+ has a vital role in muscle activation/ movement. Smooth muscles: no organized sarcomeres: thick and thin filaments are scattered throughout the cell. Both filaments contractions and control are from ca2. Four general ways that cell conduct movement: driven by active reorganization of the cytoskeletal network. Cytoskeleton is framework for most if not all organisms. Amoeboid movement: attachment of cells and cell membranes to the skeleton to acquire movement. Example: white blood cells use this type of movement to get by throughout the body. Rate of direction and growth of cytoskeleton fibers are regulated by these cells. Allows them to maximize amoeboid movement in the organism"s body: motor protein is anchored in the membrane and the cytoskeleton can be moved.
