Songbirds sing using a type of muscle fiber called super fast-twitch muscles. These super fast-twitch muscles have a fusion frequency of -~-800HZ (compared --30HZ for the frog gastrocnemius). A researcher wanted to investigate the role of calcium in these amazing muscles. She used a special technique for measuring the concentration of Ca2+ in the sarcoplasm (=cytosol) of muscle fibers. Which graph below is the most likely changes in Ca?* in the sarcoplasm during a single- twitch? 500 400 300 200 100 Time (msec) 500 400 300 200 100 Time (msec) Ca2+ conc. Ca2+ conc.

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