Anatomy - Chapter 9 - Excitation Contraction Coupling

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Last updated 2:06 AM on 10/16/26
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7 Terms

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excitation contraction coupling

link b/w action potential (nerve signal) in sarcolemma + start of muscle contraction

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  1. neural control


signal from nervous system

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  1. excitation


action potential (excitation) releases ACh from neuron

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  1. calcium ion release


  • action potential travels through triad

  • triggers release of stored calcium


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contraction cycle starts

  • calcium binds to troponin

  • active sites are exposed

  • cross-bridges form while ATP is available


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sarcomeres shorten

actin moves onto myosin

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muscle tension produced

  • entire muscle shortens

  • muscle contraction makes tension on tendons