BISC 101 Study Guide - Final Guide: Kinocilium, Cell Membrane, Chemical Synapse
11 Dec 2017
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Lecture 23: sensory & motor systems: describe receptor potentials. Bending of kinocilium & stereocilia causes physical distortion of plasma membrane opening/closing ion channels. Focuses light onto sensory rod/cone cells in retina. Light strikes rod/cones & initiates transduction pathway. Opens. closes ion channels & changes membrane potential. Arrangement thin actin filament s& thick myosin filaments. Sarcomeres shorten by length of myosin/actin does not change. Therefore they slide past one another: describe the atp dependent myosin - actin interaction in 4 steps. 1) atp binds -> myosin head therefore detaches from actin. 2) atp hydrolysis causes myosin head to go to high energy configuration. 3) cross bridge b/w actin & myosin forms. 4) - adp + p released causing power stroke . Myosin heads can only form cross bridges when specific binding sites on actin are exposed. If ca+ ion present they bind to troponin moving troponin - tropomyosin complex. Releases ca+ cytosol (neuromuscular junction: define t - tubules.
