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@learningenglish.01: Practice Listening Toiec #learnontiktok #tuhoctienganh #learnenglish #studyenglish #xuhuong

learningenglish.01
learningenglish.01
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Thursday 29 October 2026 05:29:55 GMT
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learningenglish.01
learningenglish.01 :
What is your answer ?
2026-10-29 05:33:29
0
vhienbk
Hiền :
cca
2026-10-29 10:33:39
0
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How do your muscles actually contract? Every movement begins with communication between your nervous system and skeletal muscles. A motor neuron activates the muscle fiber, calcium is released, and proteins called actin and myosin interact inside tiny structures called sarcomeres. As millions of sarcomeres shorten together, muscle fibers generate force—allowing the whole muscle to produce movement. When stimulation stops, calcium is returned to storage and the muscle can relax. From nerve signal → calcium → actin & myosin → movement. #MuscleContraction #AnatomyAndPhysiology #HumanAnatomy #MusclePhysiology #MedicalEducation
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