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What part does tropomyosin have in myofibril contractions?
Moves out of the way when calcium ions bind, provides energy to move myosin head
What part does myosin play in myofibril contractions?
Head binds to actin and pulls actin past, myosin detaches from actin and moves further along, this uses ATP
How do calcium ions cause myofibril to start contracting?
Calcium bonds to the actin, causing myosin to be displaced, uncovering binding sites to allow actin to bind
Describe the events that occur within a myofibril that enable it to contract
Myosin heads bind to actin, causing actin to slide relative to myosin, energy provided by hydrolysis of ATP
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