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IN CLASS NOTES = STEPS OF A MUSCLE CONTRACTION STEP 1 •Calcium ions present •Ca+ binds to troponin which makes tropomyosin move out of way for myosin head to attach STEP 2 •Cross-bridge attaches. •ATP breakdown provides energy to ready the myosin head for a power stroke •Myosin head attaches to exposed binding site on actin and the power stroke is accomplished STEP 3 Cross-bridge (myosin head) springs from raised position and pulls on the actin filament. STEP 4 • Cross bridges break ATP binds to cross-bridge (but is not yet broken down) Myosin heads are released from actin STEP 5 As long as calcium ions and ATP are present, this walking continues until the muscle fiber is fully contracted