Gms 6474 Study Guide Questions With Answers

GMS 6474 study guide QUESTIONS WITH
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ANSWERS

relaxed sarcomere - CORRECT ANSWERS ✔✔z disks
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I band
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H band
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M band|\




constricted sarcomere - CORRECT ANSWERS |\ |\ |\ |\ |\



✔✔sarcomere shortens |\




I band shortens
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H zone disappears
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thick and thin filaments overlap DONT shorten
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1st step of cross-bridge cycle - CORRECT ANSWERS
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✔✔BINDING
activated myosin binds to actin |\ |\ |\ |\




ADP and Pi are still bound to myosin
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2nd step of cross bridge cycle - CORRECT ANSWERS
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✔✔POWER STROKE |\




myosin head swivels |\ |\

, movement of actin filament |\ |\ |\




ADP and Pi released from myosin
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(Pi is released first, before ADP is released)
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3rd step of cross bridge cycle - CORRECT ANSWERS
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✔✔DISSOSCIATION
ATP binds to myosin
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Actin and myosin dissociate
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(cross bridge detaches) |\ |\




4th step of cross bridge cycle - CORRECT ANSWERS
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✔✔ACTIVATION
ATP hydrolysis energy activates myosin head
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ADP and Pi remain bound to myosin
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if Ca2+ still present, cycle continues
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how does Ca2+ effect the cross bridge cycle - CORRECT
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ANSWERS ✔✔Ca2+ is needed for the troponin to move |\ |\ |\ |\ |\ |\ |\ |\ |\



the tropomyosin off the actin
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when Ca2+ runs out, the cross bridge cycle will stop
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troponin has 4 Ca2+ binding sites |\ |\ |\ |\ |\