QuestionsA. What happens to the axon potential that arrives at the sarcolemma?B. What happens once the action potential arrives at the terminal cisternae of sarcoplasmic recticulum?C. What happens once calcium ions are released into the sarcoplasm? 2. Excitation-Contraction Coupling: (answer in your own words)ABC' EXCITATION-CONTRACTION COUPLING• Excitation-contraction coupling: Link between generation of action potential insarcolemma and start of muscle contraction. Occurs at triads.Neural control: SMF contracts when stimulated by motorneuron at NMJ in form of action potential at axon terminal ofAxen terminala neuronExeitationExeitatienSarcolemmaExcitation: Action potential release ACh into synaptic cleftand produce an action potential across sarcolemmaRelease of Ca2+ Action potential travels alongsarcolemma >T tubules >triads and triggers release ofCa2+ from terminal cisternae of SRContraction Cycle Begins: Ca2+ bind to troponin andexposes active sites on thin filaments for myosin to bind,cross-bridge formation, and will continue as long as ATP isTtubuleCytosolSarcoplasmie retioulumCalciumlon releaseATParound.Thick-thinSlament interaetionSarcomereshortening takesplace, and generationof muscle tension onCaMyosin tail(thick filament)Muscle fibercontractionTropomyosinCross-bridgeformationTroponinleads toCaG-actin(thin filament)tendons at either endCaNebulinof muscles result in aActive sitecontractionTensionproduction

Muscle contraction begins when there are calcium ions and ends when calcium ions are pumped back…

Answered: What happens to the axon potential that…

1st Edition

ISBN:9781938168130

Author:Kelly A. Young, James A. Wise, Peter DeSaix, Dean H. Kruse, Brandon Poe, Eddie Johnson, Jody E. Johnson, Oksana Korol, J. Gordon Betts, Mark Womble

Publisher:Kelly A. Young, James A. Wise, Peter DeSaix, Dean H. Kruse, Brandon Poe, Eddie Johnson, Jody E. Johnson, Oksana Korol, J. Gordon Betts, Mark Womble