Muscles

Ca2+ diffuse into myofibrils from the .......... ............

calcium ions -> tropomyosin -> reveals

• myosin head binding sites

• actin binding sites

• binding sites on the myosin

• binding sites on actin

myosin heads attach to exposed binding sites forming an

• myosin bridge

• actin-myosin complex

• actinomyosin bridge

• actin-myosin head complex

Calcium ions activate ....... on the myosin head allowing for hydrolysis of ATP to ADP + Pi

which of the following is true in the role of ATP in the sliding filament model of muscle contraction?

• binds to myosin head, detaching myosin from actin

• hydrolysis of ATP causes release of energy to drive power stroke: a bend/swivel of myosin head

• used in active transport of calcium ions into the sarcoplasmic reticulum

• prevents anaerobic respiration on the myosin head

what filament makes up the I band on the sarcomere?

which is the most correct when regarding the A band

• both myosin and actin filaments

• actin filaments

• myosin filaments

what neurotransmitter binds to complementary receptors on the sarcolemma to start off the muscle contraction?

after depolarisation of the sarcolemma, the AP travels down the .... ...................

phosphocreatine acts as a store of