GMS 6474 study guide QUESTIONS WITH ANSWERS

GMS 6474 study guide QUESTIONS WITH
|\ |\ |\ |\ |\ |\




ANSWERS

relaxed sarcomere - CORRECT ANSWERS ✔✔z disks
|\ |\ |\ |\ |\ |\




I band
|\ |\




H band
|\




M band|\




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



✔✔sarcomere shortens |\




I band shortens
|\ |\




H zone disappears
|\ |\




thick and thin filaments overlap DONT shorten
|\ |\ |\ |\ |\ |\




1st step of cross-bridge cycle - CORRECT ANSWERS
|\ |\ |\ |\ |\ |\ |\ |\



✔✔BINDING
activated myosin binds to actin |\ |\ |\ |\




ADP and Pi are still bound to myosin
|\ |\ |\ |\ |\ |\ |\




2nd step of cross bridge cycle - CORRECT ANSWERS
|\ |\ |\ |\ |\ |\ |\ |\ |\



✔✔POWER STROKE |\




myosin head swivels |\ |\

, movement of actin filament |\ |\ |\




ADP and Pi released from myosin
|\ |\ |\ |\ |\




(Pi is released first, before ADP is released)
|\ |\ |\ |\ |\ |\ |\




3rd step of cross bridge cycle - CORRECT ANSWERS
|\ |\ |\ |\ |\ |\ |\ |\ |\



✔✔DISSOSCIATION
ATP binds to myosin
|\ |\ |\




Actin and myosin dissociate
|\ |\ |\ |\




(cross bridge detaches) |\ |\




4th step of cross bridge cycle - CORRECT ANSWERS
|\ |\ |\ |\ |\ |\ |\ |\ |\



✔✔ACTIVATION
ATP hydrolysis energy activates myosin head
|\ |\ |\ |\ |\




ADP and Pi remain bound to myosin
|\ |\ |\ |\ |\ |\




if Ca2+ still present, cycle continues
|\ |\ |\ |\ |\




how does Ca2+ effect the cross bridge cycle - CORRECT
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\



ANSWERS ✔✔Ca2+ is needed for the troponin to move |\ |\ |\ |\ |\ |\ |\ |\ |\



the tropomyosin off the actin
|\ |\ |\ |\




when Ca2+ runs out, the cross bridge cycle will stop
|\ |\ |\ |\ |\ |\ |\ |\ |\




troponin has 4 Ca2+ binding sites |\ |\ |\ |\ |\