Anatomy final sarcolemma sequence Crossword
                 
                 
                 
                 
                 
                 
                 
                 
                 
                 
                 
                 
                 
                 
 
 
Down: 1) calcium is released from the sarcoplasmic reticulum ad actin sites are activated. calcium ions once released begin binding to troponin. tropomyosin blocking the binding of actin is what causes the chain of events that lead to muscle contraction. as calcium ions bind to the troponin it changes shape which removes the blocking of tropomyosin. actin active sites are then exposed and allow myosin heads to attach to the site. 2) ATP broken down and uses energy for other things3) myosin heads attach to actin and form cross bridges, ATP is broken down, myosin binds to the exposed binding sites and through the sliding filament mechanism the muscles contract.4) myosin head pulls the actin filament ad ADP and inorganic phosphate are released. ATP binding allows the myosin to detach and ATP hydrolysis occurs during this time. recharges the myosin head and then everything starts over again Across: 5) cross briges detach while new ATP molecules are attaching to the myosin head is in low energy configuration6) muscle relaxation7) impulse gets to the unit, travels alog axo and enters the muscle through the neuromuscular junction. calcium channels open, move to axon terminal causing synapse vessels to fuse. this causes release of acetylcholine8) impulse spreads along the sarcolemma. moves deep inside the muscle fiber down to the T tubules and the action potential triggers release of sarcoplasmic reticulum
 

 

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