BIOL 1334 Lecture Notes - Lecture 15: Collagen, Troponin, Spasm
13 Sep 2016
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Stabilize joints: muscle tendons go across the joint. Glucose + o2 > h2o, co2, 36-38 atp. Fat + o2 >h2o, co2, more atp. Conductivity: conduction of action potential or propogation. Muscles: deep fascia [white shiny covering, connected with the superficial fascia which is connected hypodermis] Muscle fiber- muscle cell enclosed by sarcolemma, mitochondria, nuclei, sarcoplasmic reticulum [contains calcium]; 10-500 m thick. Ca2+ leaves sr > binds to troponin >moves tropmyosin away >myosin binding site exposed >cross bridge formation >contraction. Myofibril- linear arrangement of sarcomeres; 1-10mm thick. Each actin is surrounded by 3 myosin; each myosin surrounded by six actin. Ratio is myosin to actin is 1:2. Knee joint: for lab: biaxial; for class uniaxial; synovial & diarthrotic. Ca2+ pumped back into sr > atp used. Add new atp to myosin head to detach cross bridge. Rigor mortis > no o2, no atp, cross bridges do not detach; causes stiffness.
