Role of Calcium in Muscle Contractions(A&P)
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Where is calcium stored in resting muscles?
endoplasmic reticulum
What happens when calcium attaches to these proteins?
they move the proteins aside to uncover the binding sites
Two additional proteins that block the actin filaments where cross-bridges can form
troponin and tropomyosin
What four things are needed for muscle contractions?
actin, myosin, ATP, and calcium
