spectrin cross links microvillus actin filament bundle membrane terminal 0.2um intermediate filaments Figure 16-77 Freeze-etch electron micrograph of an intestinal epithelial cell showing the terminal web beneath the apical plasma membrane. Bundles of actin filaments forming the core of microvilli extend into the terminal web where they are linked together by a complex set of cytoskeletal proteins that includes spectrin and myosin-I. Beneath the terminal web is a layer of intermediate filaments (From N. Hirokawa et al., J Cell Biol. 91: 399-409)
Figure 16-77 Freeze-etch electron micrograph of an intestinal epithelial cell, showing the terminal web beneath the apical plasma membrane. Bundles of actin filaments forming the core of microvilli extend into the terminal web, where they are linked together by a complex set of cytoskeletal proteins that includes spectrin and myosin-II. Beneath the terminal web is a layer of intermediate filaments. (From N. Hirokawa et al., J. Cell Biol. 91:399-409)
(4)Stress fibers Composed of actin filaments and myosin-II Focal contacts← Stress fibers→ Focal contacts IFs Response to tension
(4) Stress fibers Composed of actin filaments and myosin-II Focal contacts Stress Fibers Focal contacts IFs Response to tension
(5 Contractile ring: For cytokinesis Contractile nng Myosin Cleavage furrow Daughter ceits
(5) Contractile ring: For cytokinesis
(6)Muscle contraction >Organization of skeletal muscle tissue (b) Ba ot mace fibers omce ces) )) 肉 Potono 鍪 Thea ame Thn lamonte
(6) Muscle contraction ➢Organization of skeletal muscle tissue
Sarcomere Z disc dark band light band I band end A band -end I band H zone Thick filament Actin filament end sarcomere 2.2 um light band dark band light band Z line Z line z disc ne z dis thick filament(myosin) thin filament (actin
➢Sarcomere