Uncovering binding sites for myosin on actin myofilaments involves troponin binding to ____________.Multiple ChoiceT tubulestropomyosinphosphatecalcium ions

When calcium ion binds to troponinQuestion 9Select one:a.active sites on the myosin are exposed.b.muscle relaxation occurs.c.myosin shortens.d.tropomyosin moves into the groove between the helical actin strands.e.actin heads will bind to myosin.

The actin-myosin bond is broken by the binding of __________ to the myosin head.Multiple ChoiceATPphosphateADPtropomyosin

In the rest state, a subunit of troponin masks :-A Active binding sites for actin on the myosin filaments B Active binding sites for myosin on the myosin filaments C Active binding sites for myosin on the actin filaments D Actine binding sites for actin on the actin filaments

During contraction of a muscle, calcium ions bind to ______ which moves _______ out of the way. This now uncovers binding sites on the __________ myofilament. multiple choice 1troponin; tropomyosin; myosintroponin; tropomyosin; actintropomyosin; troponin; myosintropomyosin; troponin; actin 2. What molecules are attached to the myosin head from the previous cycle of movement?  multiple choice 2ATP and phosphateADP and phosphateATP and calcium ionsADP and calcium ions 3. What is released in the process of cross-bridge formation?  multiple choice 3ADPPhosphateATPCalcium ions 4. When the myosin head is moved, what is released (from the myosin head)? multiple choice 4ATPADPPhosphateCalcium ions 5. After the myosin head returns to its upright position, what occurs if calcium ions are still present? multiple choice 5Actin myofilaments move away from the M line.The entire sequence is repeated.Troponin blocks the binding sites on actin.Myosin heads will no longer bind to actin.

ross-bridges form between binding sites on actin myofilaments and __________.Multiple Choicetroponintropomyosincalcium ionsmyosin heads