Describe what must occur before tropomyosin can move away from the myosin binding sites.Multiple choice question.The sarcomere has to shortenActin and elastic fibers have to recoilCalcium must bind to troponinATP has to bind to tropomyosin

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.

What does troponin bind to, and what happens when it binds?Multiple ChoiceCa2+; tropomyosin shiftstropomyosin; the sarcomere relaxesacetylcholine; the sarcomere shortensATP; tropomyosin returns to normal positionT tubules; the sarcomere shortens

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.

n order for muscle contraction to occur during exercise calcium must bind to which of the following proteins? troponin. tropomyosin. myosin. actin.

Put the following events of excitation-contraction coupling in the correct order.Rank the options below.Calcium ions are released into the sarcoplasm.Calcium ions are released into the sarcoplasm. open choices for rankingThe troponin-tropomysin complex moves, exposing active sites on the actin myofilaments.The troponin-tropomysin complex moves, exposing active sites on the actin myofilaments. open choices for rankingThe heads of myosin myofilaments bind to sites on the actin myofilaments, forming cross-bridges.The heads of myosin myofilaments bind to sites on the actin myofilaments, forming cross-bridges. open choices for rankingCalcium ions bind to troponin molecules on the actin myofilaments.Calcium ions bind to troponin molecules on the actin myofilaments. open choices for rankingA nerve impulse causes ACh to be released at a neuromuscular junction.A nerve impulse causes ACh to be released at a neuromuscular junction. open choices for rankingThe T tubules carry the action potential to the interior of the muscle fiber.